If you really stay with the factory cam, the 1.7's would likely be better, because they will effectively make the factory cam bigger. If you plan to get another cam relatively soon, I'd go 1.6 and plan your cam around the 1.6 rockers. I concur that there are better choices than the alphabet cams. By a strange twist of fate, I ended up going with 1.7's recently to get the lift I wanted out of a custom cam, but typically 1.6's are the better choice with a new cam.