Sounds like a case of not enough $$$.
Dude, get a good guitar first. Bother about the pickups later.
You are new to this (duh, your nick
) so just get a nice guitar, a big amp.
Then play and explore LATER.
You wanna get everything now, you have to do what I did. I got my Ibanez S520EX, Dimarzio Breeds neck and bridge, and a Marshall MG30DFX. All at once. I spent hours everyday, for like 2 weeks, google-ing, yahoo-ing, just searching up reviews, reading up forums, on this and that and this and that, before I decided to get those.
And I had a budget way more than yours...
So really, get a guitar and amp, don't think about the pups YET.
You like the LTD EC-50 so much, you read enough positive reviews about it, just go get it. Extending this thread by another 10 pages, will add more headache to you.
Don't get the Cube15, get the Cube30.