Hi mate,
I have a skyline, my mate has just purchased a soarer. They're both different sort of cars, skyline is more sporty and will get off the line faster. Soarers would be more comfortable but are quite heavy cars. They come in V6/V8 and twin turbo too...so will be a more heavy drinker compared to the inline 6 of the R33. For some reason in Aus, soarers arent as popular..maybe it could be the fuel issue, but aftermarket wise, a skyline will be much easier to mod and have support for.
Also, having been to Sapporo, please dont buy a car from there. Cars there live a very harsh life. lol especially in winter so its very prone to rust.
cheers