While I think the v2 would sound nice with the LE's, I don't know that it would rid you of that ad20 sound - detailed, yet thin and a bit bright. You'd have to move to a different a/d converter, so the cost of a new pre & a/d would push you near that of a v3. I've been running a warm mod ua5 with my A51TL's for some time now and I've been very happy with it. I had a presence mod for awhile and thought it sounded too bright with the TL's.
Go with the mod ua5, save your pennies, then sell it to move up to a v3 when you can.