Hi Gary,

Dependent on budget, I would look at the processors in the following order:

561 - Very cheap, has plenty of inputs, max output 48K
568.1 Cheap, limited inputs, can do 96K (if I remember correctly, to fronts & center only)
568.2 Mid-priced, cab do full 96K to all outputs
568.2mm Mid-priced, limited inputs, does full 96K and had multi-channel input (for connecting a HD621 or Meridian DVD player)
G-Series (G68/G61/G65) - Plenty of inputs/outputs, some people prefer 500/800 series sound, make sure PSU has been replaced recently!
861v4 More expensive, customisable for inputs/outputs

You probably need to see what's available and what's affordable for your budget. I would personally be looking for a 568.2 or 568.2mm if I had longer-term plans to change out the DSP's for 24bit versions, but don't rule out the humble 561 - it was the first 'serious' processor that I had and was a major step up from the antique 541 (Dolby Prologic only). It is still in use, driving a pair of M3's!

Good luck with your search.

Cheers,

Steve

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5k.2C, DSP33, F80
Spare: MCD, 100 Series, 200 Series, 500 Series, C15s.