Amp / receiver to drive Dynaudio Focus 220s

Just bought a pair of Dynaudio Focus 220 floor standing speakers. The 220s are rated at 4 ohms, and I hear they're not very efficient and are very power-hungry. I'd like some suggestions on what to use to drive them.

Knowing your budget would be necessary to recommend an amp.
I find Dynaudios work with a wide range of amps.
Budget is tight - say 2k. Used is best, so I can get more for the money. I'm looking for suggestions for either a pre/pro and amp, or a high-powered AVR. I've read that Dyns should have at least 250 watts of clean power available.

I'm only running the 220s with a sub, so no center channel or surrounds at this point.

One other consideration is that because of the sub, I would like a sub out jack, and also an optical audio input if possible.

2K is pretty good, You don't need to spend that much. I have the Focus 110 and have used them successfully with Naim Nait 5i and XS, only 50-60 watts. A very good powerful alternative is a NAD 375 integrated. I am currently using a Marantz PM 11S2 integrated, 100 watts/channel does fine.
If you got to have more power look at the Anthem 225 integrated. I have no experience, but have read much good stuff about it. 225 watts/channel.
All the above amps are well within budget.
Thanks for your reply, Muzikat. I currently have a Marantz SR-7005 - and at 125 watts I thought it would be enough, but I don't think it's rated for 4 ohms.

I'll look at Naim and Anthem again, but I'm pretty sure from earlier searching that they don't have sub outs or optical ins.

heard focus 340 with exposure integrated, i think it was 3010s2 did a nice job...i couldnt actualy think exposure will make dyns sing but it worked just fine...