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-Audio-PA-D5000.5-PAD5000.5.html
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_Precision-Power-ICE1000.4.html
http://www.sonicelectronix.com/item_44493_Hifonics-Zeus-ZRX600.4.html
http://www.sonicelectronix.com/item_112893_Soundstream-PA4.1000.html

http://www.sonicelectronix.com/item_63976_Pioneer-GM-D8601.html
http://www.sonicelectronix.com/item_94121_Cadence-FXA2500.1D.html
http://www.sonicelectronix.com/item_92498_RE-Audio-SA-1000.1-SA1000.1.html...Show more

(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=wlpa&selectedSellerId=0&adid=22222222227018258929&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=40838969792&wl4=pla-78652236752&wl5=9034049&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=online&wl12=24458370&wl13=&veh=sem...Show more