I'm pro Jackson. Out of all the guitars I've played, that's the neck I like the best. Jacksons have very wide necks (especially compared to a Gibson V), with a flat fretboard radius; made for shredding.
One thing I dislike with some Jacksons, is the balance. The Rhoads for instance is a little bit neck heavy and the Kelly even more so. I've been told that the Warrior is much better balanced than both of those, but that is second hand information from me. Xenophobe can tell you more once he drops in here. =)
If I had the cash, I'd go for a USA made Jackson. That will get you top-notch quality for a reasonable price. So far though, I'm still sticking to my japanese built Rhoads with upgraded pickups. Most bang for the buck right there.
I like Gibsons too, but their necks are too narrow for my taste (closer string spacing) and often also with a too loggy back shape. One good thing about a Gibson V is that although they're kinda heavyweight, they balance very nicely. Sitting and playing them is an issue for some people, but it's easy once you figure out how to place the guitar.
You may want to consider what type of bridge you prefer. I don't think the Warriors come with fixed bridges, while the Gibson Vs are fixed bridge only. If you typically don't use tremolos, a Floyded guitar will be more hassle than it's worth, IMO.
I don't have any experience with the ESPs, but after what I've seen, I've kinda dismissed them as ugly and costing too much. =) That may be a bit unfair though. =)
If at all possible, try to test play all three models in a shop before you hand out the cash. That will give you a feel of which one suits you the best.
'bane
