if you have the money for one now, and HAVE to spend it, i would get the intakes. it is easiest to do heads and cam at the same time. so i would save for heads and cam so you could do them now. but then again, you have to take the intakes off to take the heads off. so if you go for it, i would do it all at the same time.
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**