My other option was to go cheap and get the autotech hpfp since the same place with the APR pumps sells them. I think they're $350 installed - but I know the important part of that is the clean installation.. Think I'll be okay on S2+ with a stock IC?
I wouldn't cheap out on the fuel pump. Maybe find a used stock pump and get it rebuilt by APR, which'll end up costing about $750 total if you hold on to your own stock pump as a spare. APR's sale is on now, incidentally.
My S2+ setup definitely benefited from an IC upgrade, especially in terms of repeatable power, much better throttle response, much more power than before in summer heat, etc. You may not make a ton of power on the dyno, but you *will* make power over the stock IC in traffic or on a raging hot day, or after a few minutes of driving like an asshole.