Ar15 add-ons

ok well i could use some help! want to add some stuff like a 4 rail, front vertical grip, bi-pod, and light/laser combo...

its an A2 with bull barrel... 20"... anyways...

i was looking at firequest...

http://www.firequest.com/

do you guys prefere anywhere else? dont need Olympic quality stuff but i dont buy crap when it comes to guns either...

any helps would be grand!