I had this same issue about 6 months back. I stripped the non drive side crank arm where the pedal screws in and needed something new (was using the stock suntour xcc cranks...terrible cranks). I did my research and ended up going to a single ring on the front because of compatibility issues. what I didn't realize is that a crankset isn't like a cassette where the spacing isn't really an issue between 8 speed and 9 speed chains. 9 speed compatible cranksets should work just fine with your 8 speed chain. I don't regret my decision to go 1x8 but I could have easily bought the 9 speed compatible and have been fine. which set are you looking at in particular?