My plan is to aquire a combo DVD audio/sacd player.Will my dipole side speakers cause any problems or should I consider mono poles for sides?
Monopole or bipole speakers sound the best on music for rear speakers in med-larger rooms. In a very small room you might want to stay with the dipole's.
Properly set up and calibrated, and that is asking alot; monopoles are superior if you are serious about multichannel reproduction. You asked about sides however. That is a complex question and there are various opinions here. Lexicon published a ground breaking white paper years ago suggesting side channel info was crutial in creating a believable soundspace with accurate surround sound atmospherics that is a good place to start experimenting. Their logic 7 mode was and still is a good dsp algorithm system . Tom Holman { not sure of spelling here} of THX fame is another outspoken engineer that has his theories. Widescreen Review and Gary Reber challenged the community years ago and postulated 5 identical , equidistant speakers properly calibrated with a radio shak meter { C- Slow } and most have slowly adopted his ideas. Including me. I went from processor to processor , speaker set up to set up and after what seems like a lifetime of intense study , I have found a multichannel system that is natural and effortless. I cant speak highly enough of the Meridian in this regard . I have abandonded the side channel all together as the cohesiveness of the soundfield is solid with 5 mains . You may find 7 channel more rewarding. Your question is about surrounds. If you are using only 2 speakers and must put them on the sides then conventional wisdom suggests dipoles. I do not find the effect natural for multichannel but on theatre , its ok. I prefer doing multichannel correctly and theatre will follow quite nicely. My thoughts are to start with less and progress as your observations about the room interaction and your particular taste grow and change with each move you make within the system. I would start with 5 . Place monopole { matched to mains as closely as possible } not directly behind you but at an angle about half way between behind and to the sides. I cant give a specific degree because in each room , things are different. USE AN SPL METER. Your friends will claim their ears are superior , I doubt it. Good luck and research past issues of Widescreen review such as the issue with Star Trek on the cover and the article penned by Peter Montcrief { spelling? } called "doing it right" is indespensible as a learning tool in this area even though it is a pre dolby digital article. Hope this long winded essay helps.
I totally agree with Brainwater. I have a Lexicon MC-1 processor, and up until recently I was diappointed with it's performance for HT. It turned out the problem was not with the processor, but rather my speaker make-up and positioning.

I had been trying to combine a 2-ch and a 7.1 HT system with both sharing the 2-ch main speakers. Bad idea, in that they were not a good match with the center and surrounds. I decided to split the systems and go with 5 matched speakers for HT and eliminated the side surrounds. I located the rear surrounds in the rear corners of the room firing right at my listening position. What a huge difference! The surround field is much more enveloping and convincing as compared to before, and with 2 less speakers.

I'm convinced that the most important factor in surround is having 5 identical speakers. In my case 4 of the 5 are identical, with the center having essentially the same drivers but in a horizontal orientation with the ability to aim the tweeter via the use of a built-in led light and adjustable tweeter. They're all Triad In-Room Gold speakers. I can't speak highly enough of them. For me they turned out to be the Holy Grail of surround, and I've been looking for the past 7 years.
kenl , sounds like you have indeed struck " gold" . Happy listening.
Check my Multichannel Music system for component details, but I have 6 identical speakers (one is a rear surround, but is not currently used by any of my software). All are stand mounted at the same height and equidistant from the listening position. I currently have this in a 10x10x8 room. That is unfortunate, but currently necessary. I am moving the beginning of April and will have a dedicated listening room of 11x15x8. Still not big, but infinitely better that 10x10x8. Sony got me using the ITU standard based on the SACD-Multi inserts they and others were including in various SACD-Multi releases. It works very well for me with the multichannel music (SACD and DVD-A)I listen to.

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Happy listening!
Damn, my speaker diagram didn't work :(