Well, first (of course) be sure you don't get ripped off on eBay. You know the drill.
Second, if you're handy with soldering, then I would imagine that prying open your tablet and mucking around in there shouldn't be too difficult. I've done screen swaps in laptops, but never did anything like that to my tablets, so can't advise you much. You've been around long enough to know what NOT to fiddle with, I bet.
As far as difference, if I am right the non-VA screen is a polyvinyl (or somesuch) plastic touch-sensitive screen. To make it a VA, they either add a polarizing, hard-glass screen on top of the non-VA screen, or swap it out entirely. I *thought* -- based on my experience in glass coating -- that they would have to do a full swap, since the glass overlay would have to be touch sensitive, too, not merely slapped on top of a wacom touch screen. But others have said that it's just a glass polarizing sheet laid over the non-VA digitizer.
If that's the case, you could just buy a polarizing filter and lay it over your non-VA screen. Then perhaps go into settings and increase touch sensitivity?
I dunno... sounds stranger and stranger as I type this. Your best bet would be to buy a VA screen and swap it out entirely with your current non-VA screen. It should be a simple screws-and-solder job, which is difficult for most people, but sounds like you could handle it. Of course your warranty is shot after that!
If you *do* do it, take pictures and post the "operation" here!
I can't help with opening the LE series since I only have the M series. But if it's similar, you just (a) pry off the side bumpers, (b) remove all removable doors (for the hard drive, RAM, etc.), and then unscrew the exposed screws. Also look for "hidden" screws which have been covered over with plastic or rubber inserts. I'd do the operation with the screen lying down, lifting the back up from it.
Also, be REAL careful not to get any dust or (of course) metal particles inside your tablet while you are working. That would foul up your digitizer big time.
Another thing you could do is offer a swap to someone who has a VA version. You give them yours, plus a few bucks, and maybe they could swap out with you, if they're not in love with the VA screen??