As for antennas, I recommend for your first aftermarket HT antenna, get one of the +/- 17" thin flexible type. Everyone makes them, but some are more flexible than others. I like the Opek (a knockoff of Comet) -- got it for $15 at a hamfest. Truly amazing increase in performance. My others (for comparison) are the stock duckies (for VX-6 and VX-2), Maldol MH-209SMA (teeny tiny) and a more middle of the road Comet SMA-503 (8.5").
Theory being you can leave a shorter (and more rugged) model on the rig and just store the long whip in your EDC bag (it bends over pretty well). Just stick the 2 ends down in a large pocket and you don't even know you've got it with you.
The 17" whip is my all-star of HT antennas (not counting external coax-fed ones, obviously).