Harbeth - Audio Research?

I have owned Thiels for many years and using a pairs of 3.6 now. I am thinking of moving to a new direction as I am getting tired of listening only to good recordings. Some recordings sounded terrible on Thiels. I listened to Harbeth once and I thought it is more musical and natural than my Thiels. Will I loose out by changing?

the audio research and harbeths will go well.
Go for the SHL5s although the M30s are also quite nice.
The Harbeths for that matter will go with most amps.

You know, the thing is, I really love the Harbeths but if you haven't heard a lot of comparisons then your upgrade bug talks to you. "Wonder how those Thiels would sound" "Wonder how those B@W's would sound" It's definately an affliction!!!!! Wish there was a speaker borrowing company like the cable company.

any product that makes one listen more is worthy

The Harbeth is more "natural" and "musical" and will be enjoyable on a wider range of recrodings. You don't find many Harbeth owners unhappy with their speakers. I would love to have a room big enough for the M40s, but the HL5s are proabably perfect for most normal size rooms (12x18 or 20). Will you loose out? Doubtful you'll feel that way - though the HL5 proabably don't go as deep as the Thiel. A more "musical" and "natural" option while maintaining the phase coherency and time alignment you are use to (these type of speakers seem to soundstage differently) are a pair of the Vandersteen 3A Sig, which will indeed be as full-range as what you are accustomed to, and very frequyently matched up with 100 watt Audio Research amps. Add a pair of 2Wq subwoofers and you have one hell of a good speaker system.