An old thread but in case anyone looks at it and is thinking about buying the LS... beware!
There is quite a limited aftermarket in terms of specific parts for this model, unlike the little sister Civics where there is a hundred different makes for each part. I found this really frustrating as I wanted lots of bolt-ons to choose from.
Tuning is still possible, you just have to look a little harder.
Go for the ES if possible, you get leather interior and the F22B5 kicks out 147bhp stock. There is also a lot more information out there for tuning them. At least I've found more and I spend hours surfing for tips.