The 510 is completely different. It's not what you'd call a high end piece, plus the EQ is parametric only which can be pretty tricky to set up. I'm not saying it's bad, just that I never considered it for my system. My previous processor was a Rockford EPX2 with the 28 band EQ card installed.
http://cgi.ebay.com/Rockford-Fosgate...QQcmdZViewItem
The 510 would have been a step down for me. In fact you might look at the EPX2 as they are going pretty cheap. They take analog only for the input, but are good units.
Typically the H701 go for $500 for the brain, but $375 is a pretty low price. If you don't use the headunit to control it you would need the RUX controller which is about $150-$200 and it has a dedicated volume knob.
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