Need advice, sub/amp

couple of questions about that amp..(I'm pretty much a newbie when it comes to amps/subs, but I'm learning quick)..how would I set this amp up? I would run four channels into the 4 ohm satellites (56W RMS) and then bridge the two sub channels into a single channel at 2 ohms (wiring the sub in parallel)..what the wattage be on the bridged channel?

you are correct about the satellites--it would 56W RMS per channel.  For the sub, the 2 channels get bridged into one, and it puts out 287W RMS.

the infinity amp is pretty good.  there will always be skeptics, no matter what brand it is, but I've been pretty impressed with tthese amps and this one in particular is definitely a lot of amp for the money, as you noted.  Usually if the amp has a power rating conforming to the new CEA-2006 standard, that's a pretty good indicator that it's a solid amp.

What kind of sub are you going to be getting?  specifically the model number?  If it's a single voice coil sub, then as long as it's a 4-ohm voice coil that'll work perfectly for the amp.  Most amps (including this one) can only support a 4-ohm load when bridging two channels.

With that in mind, I should mention that If the sub has two voice coils, then you'd want to get one that has 8-ohm voice coils or 2-ohm voice coils.  With the 8-ohm version you'd wire the two voice coils in paralell, and present a single 4-ohm load to the amp.  Or with the 2-ohm version you'd wire the voice coils in series, and still present a 4-ohm load to the amp.  Many DVC subs have 4-ohm voice coils, so make sure you steer clear of those.