Need top end kit for Mountain cat 900 help on what pistons to buy

Hey has anyone have heard anything about SPI top end kits? I priced a top end kit with gaskets, pistons, rings for 220.00, I can get a wisco rebuild kit for 250.00 ish. Is it worth the extra money? any help would be great. I just got the sled and it only has 1500 miles but while cleaning the power valves and one cylender looked GREAT but the other side had the start of some scoreing that wasn't normal. So I decided that it is easier to tear it down and do it now than wish I did while one a mountain with a blown motor. any would be great. thanks in advance.