Not too sure if an avalon kit will fit on a camry. But you have to be careful with these sites selling "tokico suspension kits" because I almost bought one for my Gen 3 last summer. After calling them I found out that they give you tokico struts and randomly find springs that will fit. And because you have a gen 3.5 you pretty much have the same options as the gen 3 camry's:
Struts
Tokico
KYB
Springs:
H&R
eibach
sprint
etc.
Coilovers
Ksport
D2's
etc.
After tons of searching on the forums I decided to go with Tokico's with H&R springs. Hope my 2cents helps.