Priorities...

@infection also, you mentioning the ARC amp and PMC speakers further suggests to me that you just want to try something different out.  That's why I asked you if you really liked the Tannoy's.  As my friend JohnnyR has told me more than once, "you're chasing your tail".  Now that I think of it, do grab the ARC amp and a pair of Vandersteen Treo CT and be done with it.  Buy lots of music and no more tail chasin.  You can just sit back and enjoy.  Regards.......

@carmenc - relax dude, we're just having a conversation. This thread wasn't seeking advice but opinions. Difference! (Couldn't resist). I think you've missed what I mentioned re: ARC Ref 210/PMC.
Another option is the Alta Audio Rheas...

@infection .....I am relaxed Dude!  I've found my speakers/system.....not chasing my tail and all over the board like you appear to be.  Advice or opinions, doesn't seem to matter as you seem to listen to neither!  Good luck, cause you're going to need it I believe.  Regards......

What...?? I'm not 'chasing my tail'. 
You need to remember what I've said - 

I will mention again that there is nothing wrong with the sound of my current system; it's very enjoyable. The situation is primarily capitalising on the opportunity of a very good deal but requires a possible compromise.
I say possible as I may be able to replace the GamuTs with a similar performing alternative. 

@infection ....why don't we call it a truce?  I simply started out giving you my advice/opinions regarding my experience with Tannoys based on my listening room and my tastes in an effort to try and help.  Before I knew it, it turned into a back and forth about your amps.  I don't recall saying a bad thing about your Gamuts yet it seemed to me that's the way you perceived it.  Hell, I've never even heard them.  Hey we both have Tannoys so we've that much in common.  Let us know what you decide.  Regards......