To determine if you need a gap wedge you should have a significant 'gap' in distance between your PW and Sw. If those two clubs are onlt 20 yards apart, there would be no need. However, if you have 40 yrds between your PW and SW, then it would be a very good idea to get a GW.

As for bounce, 2* isn't a major difference - it's hard to hit off hardpan no matter what the bounce is.