Not sure if you have already made a decision on the LX Platinum. I just wanted to share a bit of tid bits.
The real difference in tire types lies in your driving style. If you are a calm and composed driver who is looking to maximize tread life, and prefers a quieter tire then kumho LX Platinum would be a good bet for you. If you are the type that has a heavy foot or just tends to enjoy their car, drive a bit faster, corner a lil harder or simply likes to "feel" the road then you'd probably want to consider a high performance tire. Kumho, Hankook would both do well for the price.
Also, if you live in the PA or DC area, then you have a great alternative in TireVan (
http://www.TireVan.com) a mobile tire shop with great prices. If you are outside of those two areas, I'd say try a couple of online retailers like the track or even NTB (
http://www.ntb.com)