Good aftermarket support for SC300/400?

It's about time to start looking around for a play car and the cars I'm thinking about are a MK3 Supra, SC300 or 400 (probably 300 for price issues). Is there good aftermarket support for the SC line?

sc300 has the same engine as supra, so plenty of aftermarket stuff. not to sure about 400, definitly not as much as the sc300. also you can get the 300 with a 5spd manual with would be fun