cam - you seriously need to do your homework on fuel regs and pumps.
Increasing the pump strength will assist in delivery of fuel pressure - but the effectiveness of this is severely limited by the stock injectors - and you need management to run other injectors.
besides this, you're probably not managing enough boost to justify an upgaded pump.
I dont know about other brands, but I know malpassi's let you squeeze more flow out of both the standard fuel pump AND out of the duty cycle of the standard injectors - and aftermarket regulators can provide a "backup" in-series regulator for the stock one (although the stock ones are pretty good anyway).
but until we start playing with post-fmic engines, both have limited use.....but might be worth grabbing if really cheap.