Upgrade time way past : Amp/Pre or Int for $1000

I have been an impoverished student for the past decade. Nonetheless, during that time I tried to build a good sounding system. My primary route of acquisition was through gifts (see below) and places like Audiogon or local audio resellers. Always, my goal was to buy the best possible product I could purchase for the money that I had saved (sort of the "best athlete available" on draft day).

Unfortunately, the amount of money saved was typically not very much. Also, I purchased some products (read the sub) to fix a problem (read poor bass output) that likely was not a fault of my speakers (read not enough power from the HK 3550). This has resulted in what may be an overall motley "system", which is as follows:

KEF Reference One speakers
HK 3550 integrated amp/pre/receiver (a gift)
MSB Link DAC I modded by Modwright
Marantz DR700 or Pioneer DV656A as transport (a gift)
Paradigm PW-2200 Subwoofer
cables from Modwright in trade

In all, I spent $1500 on the above, specifically for the speakers, DAC, sub, and cables. Given that the KEFs went for $2000 when I got them, I feel I did OK.

Still, I need to get a better amplification set-up, especially in light of the fact that I really like the KEFs and they require more power than I currently have. Given that I have decided to choose lifestyle over earnings, I am resigned to never being able to make that leap to truly expensive audio equipment. Even so, I should be able to get a nice amp/pre match or integrated for between $1000 and $1500 (likely used), right?

So, the question:

What would be a good amp/preamp combo or integrated amp for the $1000-1500 price range that provides enough power for the KEFs?

Suggestions? Help? Criticism on the length of my post?

Seriously, thanks for any responses.