The ac system is more than just a compressor, if you install the tiniest compressor which would be undersized for your system it will load up your engine badly too.
Find its original compressor, recondition it, install a new condenser too if old one has experienced a compressor fatality, new expansion valve (properly done as suzuki describes, not just slapping it in)
A good condenser fan and gas charged by weight after a good thorough leak down test and a good solid vacuum.
If will give you the best performance, but you have to also take care of other bits n pieces like make sure no air leaks are in the car.