well its not even a matter of DVC 2/4 SVC 2/4 its just all in how you plan on wiring. you can do 2 svc 2 ohm subs in parallel on that mono same as you could two 4ohm dvc subs. from my experience hifonics is a very good company for amplifiers and ive never heard anything bad about MB Quart, though they used to be pretty dang expensive IIRC.... check out
www.ikesound.com for some great deals on audio/car stuff
id say the big thing is to make sure however you wire your subs, your amp is able to power them at the correct power level... [ie: 2 4ohm svc subs wired parallel that will take 300W RMS apiece would need an amp running 2 ohm stable and pushing 600W RMS at 2 ohm and overpowering for the most part, is better than underpowering as well]