I have an Ibanez GAX70 and I was wondering if it's relatively simple to get a Floyd Rose Locking Tremolo installed. If not then are there any other brands?
IMO, it's not worth it to put a Floyd on (no offense) such a crappy instrument. It requires a large amount of routing, plus you actually have to buy the Floyd, so if you pay to have it routed that's about $300-$400 right there.

I believe a Kahler trem doesn't require routing, but it's even more expensive than a Floyd.