so i guess i am going to be the dissenting voice here...
your gonna psend how much to dress up a semi-crappy 500 dollar hybrid??? i'd figure out how much in total this will cost you and see if for that money you couldn't just get a brand new, less crappy, bike.
my thoughts on this are summed up by one of my favorite quotes "you can put lipstick on a pig, but it's still a pig."
obvioulsy you may feel different... but i'd encourage you to look at how much all these upgrades will cost you before you jump in.