In the UK, there are currently four flavours of IS200, starting with the "basic" S model. You can find details at Lexus UK.
Essentially the manual is a 6cyl in-line 2.0litre with 6-speed manual transmission, producing 153bhp & 144lb/ft of torque @ 4600rpm, and good for a 0-62 dash in 9.5sec. The "SE" model adds 17" alloys, leather/ecsaine seats, two extra speakers, headlamp washers, and electrically heated/adjusting seats. The "Sport" model also adds aluminium pedals, rear privacy glass (tints to you & me), limited slip diff, 15mm lower ride height, and boot lip spoiler. There's also a "SportCross" IS200, but for mods I would guess it's a non-starter?
I would guess you'd want to go for the "Sport" as it has the slip diff & lower ride height. However, I'm a complete "IS mods virgin!" so I couldn't tell you about transferring your current mods. But there's loadsa guys here who are experts in such things, so I'm sure they'll be along to help you :) :)
PS - Welcome to the UK! when are you moving over here?