i have a 98 gsr, and in stock form the usdm gs-r's have 170hp, while the usdm type r's have 190hp. the only difference is that the type r uses a factory ported b16 head, and comes with dual valve springs, stronger valves and a better set of cams. also it doesnt share the same intake manifold bolt pattern as the type r, it has its own. it is also better for high compression engines due to a smaller combustion chamber volume. a gsr can go for between $3k and
$8k depending on the year, but id reccomend anything between 94-97. any more honda info, jus let me know.