When I rebuilt mine I went .030 over, shaved head, and decked block. I tried Hawks cam but we either got a bad grind, or it is too tall. It ended up breaking all the adjusting screws for the lifters twice. They were really good about it and wanted to try out a different cam, but I just wanted to get my car on the road.
I can feel the difference from a stock 16v. It's very snappy and loves to rev, but like any Suzuki 4 cyl it's all top end. I ended up spending about $1800.00 when all was said and done. You could save about $800.00 doing it yourself.