Recommend amp(s)?

Mixing subs like that won't get you anything other than sloppy sound quality - but if you just treat them like 3 subs you'd be looking for an amp that's 600-800w rms at 1 ohm (wiring three svc 4's parallel is 1.3 ohms).

Then for your 4 speakers you'd want a 4 ch that's 50-75w rms per channel.

So you can either go with two amps OR you might find a 5 channel that will fit your needs.

The problem with the 5 ch option is you're not going to find many 1 ohm stable subwoofer channels, which you need.

Here's one I found: http://www.sonicelectronix.com/item_39895_Polk-Aud...

but it's only 500w so each sub would see 150w rms or so.

On the other hand, you have a number of options with 2 amps.

http://www.sonicelectronix.com/item_112649_Precisi...

http://www.sonicelectronix.com/item_44493_Hifonics...

http://www.sonicelectronix.com/item_112893_Soundst...

http://www.sonicelectronix.com/item_63976_Pioneer-...

http://www.sonicelectronix.com/item_94121_Cadence-...

http://www.sonicelectronix.com/item_92498_RE-Audio...

(A) I don't recommend that you mix different subs in the same system. The sound is usually sub-par.

(B) Forget about peak power ratings. They are of no practical use.

(C) I'd keep the 10" sub, dump the two 8's, and get a Kenwood KAC-7005PS five channel amp. http://www.walmart.com/ip/24458370?wmlspartner=wlp...