Best bargain integrated amp?


I'm in the market for a new integrated amp. I currently own a Cambridge Audio 640A, but am begining to notice its short commings. I'm looking for a more refined amp with more power. I listen to mostly rock, jazz, acoustic guitar stuff: Leo Kottke, Nick Drake etc. in that order.

I would like to go second hand and spend no more than $700.00, and I guess my question is will I notice a considerable improvement sound quality with a second hand amp of this price?

I'm interested in the Odyssey Audio Cyclops but have yet to find it used. What other units should I consider?

My system:
Speakers: Acoustic Energy Aelite 2
CDP: ShengYa CD-s10 (tube)
Interconnects: Kimber Kable Timbre
Speaker Cables: PS Audio X-Stream Plus

Thanks for the help.
catt3
I second the nomination for Naim Nait 5i. There are so many nice integrateds out these days, from budget to high-end, I doubt any one can claim to have compared them all. But I've sampled enough to say the Nait is very fine, punches above its weight, and stands up well to far more expensive kit.
I've had mine for about 6 months. It continues to please and even surprise. It offers such a good balance across the range of musical attributes that you tend to just enjoy without missing any 'ultimates' that may available higher up the food chain, so to speak.
The music comes through free of any tendency to harshness or undue brightness, with good pace, rhythm and a slight warmth or richness without loss of clarity.

Some limits on versatility though, in terms of adaptibility to headphones for example.

You may be able to stretch your budget just a little for a used one, or perhaps the previous model Nait 5 may serve.
You may get a brand new one from kellsieavdesign.com within your budget. One of the best integrated.
ASL AQ1001DT for about $1,500 will give you a tube integrated that has the lush qualities of tubes, but will also give you a lot of the positive attributes of solid state.

If you want solid state I agree with above Naim Nait 5i received great reviews in "the absolute sound". I beleive they compared it to the best integrateds no matter what price.
For the money your only talking about spending, i would highly recommend trying the Kavent integrated amplifier through Kellsie audio and video designs..
www.kellsieavdesign.com... I think you might be quite impressed and may not look back..
Good Luck,
Dave