I would think the remote start technology has caught up enough with keyless stats that just about any big name brand you go with should work just fine. The bigger question is the shop where you get it installed up to speed? I know a couple years ago when I looked into this it was still a bit iffy on how well it would work, but as more and more cars are offering push button starters I would assume things have been worked out. I did a search and didn't come up with any brand names that people on here are using. I would suggest checking at your local install shop and see what they reccomend and be sure to ask how much experience they have with Lexus setups like ours.
Post your findings for sure though. I might venture back into this realm myself before long.
Post your findings for sure though. I might venture back into this realm myself before long.