to be completely honest with you, the GSR motor you've chosen was a great start off point, BUT as for the Skunk 2 Stage 1 Head... i didnt even know they did machine work there, do they???
If you were talkin about the stage 1 Camshafts then sure go for it, skunk 2 make some pretty good cams... the JG edelbrock intake manifold is also a good choice but again i have a lil bit of an objection, unless you do some major head work then it wont even be that functional for you, and also do you plan on getting a bigger throttle body one you get this manifold? if not then completely pointless... the AEM Fuel rail, i have it, and it works great for me but again i stress this are you going to do major head work or block work? if not then stick with the stock rail and injectors for now, believe me they'll work just fine...
whats your budget look like? how much are you willing to spend to get to the point that your happy? im sure we can work something out where you'll make good power and you wont be buying un-necessary parts right now