If you have not yet modded the Gaggia's steam wand, you'll have an uphill struggle to get microfoam, regardless of the pitcher. Assuming you have taken off the outer panarello sheath, the plastic nozzle is definitely on the short side. You might want to try one of these:http://www.wholelattelove.com/Gag...annarello_Wand.cfm
Re pitchers, I used to think the bell shape would be better for a rolling wave (toroidal) with the wand in the center, pointing straight down. Nowadays, though, I'm not sure the pitcher shape really matters -- I now use a straight-sided pitcher with my Lusso's 3-hole steam tip, and it works brilliantly.
BTW, I agree with Bushrod that a smaller pitcher will likely produce better results when you're steaming for 1 drink at a time.