I would definitely suggest trying to pick out our own speakers. You need to audition them and make sure you like the sound. Different sets of speakers can sound very different. If you just ask the shop to pick a set for you, you might end up with expensive speakers that you hate.
MODS: PW TMIC, Cobb catted DP, HKS cat-back, AVO filter, Bren e-tune; Konis/Epics, Advan RCII