I ran a LS7 cam on my car until I did the BTR PDS 2 a year ago. The LS7 has slightly less lift to work with the upgraded ratio rockers of a LS9 cam but other then that, they are nearly similar from what I remember.
If money is a problem then by all means do a LS9 cam, they can be had used for $50 from the ZR1 guys. Since you would have to pull heads to do lifters for DoD delete might as well do a real cam though. If you are looking at a BTR cam, just do the stage 2 or even stage 3, supposedly the 3 has some push against it though but is all up to the tuning from what I've read.
The thing you will need to figure out is the fuel delivery, and MGM is on point. Vaporworx setup is slick and the V pump is simple and reliable and can be upgraded easily to work with Vaporworx to supply more then enough fuel for what the LSA can support.
Be prepared to look at doing a brake upgrade, you'll find your needle moves up in speed faster then it can slow down with an LSA.
I've done the whole gambit of dynoing with the LSA with each change really and other then having a good starting # with the LS7, my numbers are below. I haven't made any runs with my new Interchiller setup and the added timing from that. Only other thing I'm lacking is a 2" primary header and 3" exhaust, currently running a Pacesetter 1 3/4 and 2.5" magnaflow setup.
For reference on my build -
LS7 cam, bolt-ons + LSA = 515whp
LS7 cam, bolt-ons + LSA, vaporworx/vsetup = 535whp
LS7 cam, bolt-ons + LSA, vaporworx/vsetup, 5" intake = 560whp
LS7 cam, bolt-ons + LSA, vaporworx/vsetup, 5" intake, 2.55" pulley = 614whp
BTR PDS 2 Cam, bolt-ons + LSA, vaporworx/vsetup, 5" intake, 2.55" pulley = 643whp