Do them both dude. I went with a custom set of Comps from Modular Power House and don't regret it at all. Long Tubes were one of my first mods that I did though, so if you can put together the scratch for both then more power to you
Go with the cams. I know if I want to get them now I have to have them remove the SC. Don't know which kind of SC you're getting but as long as they're installing it, might as well have them put the cams in before hand so you save on labor later.
Won't it be a lot more annoying to install cams after the S/C is on the car? I would do the cams now because the installation would just become more time consuming later(and more expensive in labor if you don't do your own work)...