If you're sticking with those speakers, I'd recommend a class D amplifier. There are loads of brands to choose from. I have a pair of class D monoblocks that I purchased here for $600. They put out 500 w into 4 Ohms, which is the stated impedance of my speakers. My speakers both have side firing 12" drivers and my amps control them just fine. I haven't found the need for a sub yet.
+1 on what @auxinput says about needing a preamp. I don't know if I'd go the HT processor route, as I prefer to keep everything stereo and analog, but a preamp is necessary. Unless, of course, you buy an integrated amp, which combines the amp and preamp into one chassis. You could even find an integrated with a built in phono preamp and get rid of the need for another box. And there are plenty of class D integrated amps to choose from...
+1 on what @auxinput says about needing a preamp. I don't know if I'd go the HT processor route, as I prefer to keep everything stereo and analog, but a preamp is necessary. Unless, of course, you buy an integrated amp, which combines the amp and preamp into one chassis. You could even find an integrated with a built in phono preamp and get rid of the need for another box. And there are plenty of class D integrated amps to choose from...