I have demoed all the above units as well..Here are my thoughts...
The Krell is full of bugs like the previous posters have noted. I really wasn't all that impressed with its sound quality either. Krell's name alone makes people tend to lean towards it by reputation only, but it actuality, their digital pieces of equipment really lack a lot compared to the Classe/Citation/Proceed/Levinson, etc. Now, what Krell does DO well and always have is their amplifiers. You will be hard pressed to find an amplifier than can match both the bass slam and the detail that the krell can bring out.
Overall, I think that HTS is about a 3/5 rating *audiophile level rating system*
The Proceed is my favorite...It is rock solid, very quiet, tons of inputs and sounds great in both 2 channel and movies. It also has broadbast quality S-video switching. In my opinion, this is a far superior pre-amp than the HTS is. 5/5 stars
The Lexicon I would stay away from...Sound is always interpreted differently by each listener, but the two-channel stereo sound really didn't impress me. In fact, I thought my old HK receiver sounded just as good and maybe better..Now for home theater, that is a different story..The MC-1 is awesome. Quite possibly the best home theater processor under 10k. Since I am more concerned with stereo sound, I give it a 2.5/5 rating.
The Citation is really the surprise here...I demoed all the above and settled on the Citation 5.0. I got one for a really good price and decided to get it. It is made by madrigal (same as proceed/levinson). For 2 channel stereo, it is better than ANY unit above. The only unit that I have listened to that sounded better in my system was the EAD Signature for two channel. For home theater use, it lags slightly behind the proceed and the lexicon, but not by much. 5/5 rating.
Anyway, just my two sense.. Feel free to email me with any questions..I have demoed nearly ever pre-amp in my system known to man...
1. Proceed
2. Citation
3. HTS
4. Lexicon
AggieBob98@home.com
Bobby