One of either hasegawa or fujimi's r32 will be in two versions soon, there is a thread about a new tool version coming out somewhere on the site. The aoshima r35 is available as a liberty walk body kit curbside as well as stock versions and there are also some race versions. The r33 i believe is only available from tamiya (i'm probably wrong on that but its the only r33 I've seen. I think the tamiya r35 could be described as curbside plus since it has and engine plate rather than a full engine but there is an aftermarket engine available from hobby design. I think fujimi also do a 4 door r34 and a stagea (basicly a skyline wagon). If you're not worried about having full detail I dont think you can go wrong with any of these 3 manufacturers but if it was me I'd go tamiya first choice. A look on 1999.co.jp or hlj.com will let you see what the kits include as well as the instructions as some japanese kits have very poor interiors as I'm sure you know already. There are also kits of the skyline exuctive cars (think mercedes type cars) and the classics available from the first gtr in the early 70's til now, and a fujimi kit of an earlier one.