i bought gloves after a week and they were one of the best accessory buys of them all. i pretty much got everything on your list except a reflective vest and bike rack.

for a frame pump i bought a little topeak. for lights i bought the planet bike superflash + 1w blaze combo on amazon.

for a helmet i really wanted one that i felt looked good so i wouldnt worry about that part of it, also a rounded one, safer than the wacky jaggedy ones that can get caught on pavement/obstacles as you land. i went with a superlight by TSG:

http://www.amazon.com/Superlight-Mul.../dp/B000O3NTO2