Obvious one is a newer Cambridge audio pre if you get good results with CA. I spotted this one for you, £300 off.
http://www.richersounds.com/product/.../camb-851d-blk

Then if you are spending a grand, the cyrus pre 2 dac is good, for a detailed and dynamic fast paced sound. Some are above this price but with a dealer discount you'd get it for £1k I reckon. I use cyrus with pmc to good effect.

Or naim, you'd get a nice warm sound . Something like this might be achievable at a grand

http://www.audiot.co.uk/products/nai...ifier-210.aspx

It's regrettable that lots of good makes don't do pre amps at certain prices, or any pre amps at all, but I think Cambridge audio, cyrus and naim are pretty flexible to offer different price pre amps.

I'd reckon Cambridge audio are closer to the cyrus sound than naim. But it looks like that richer sounds amp could be a bargain particularly as it's likely to sound better than the older model you tried.