Good morning Buddy. Make sure to check with your LBS to find out what you can get away with or call the manufacturer. A longer fork will increase your head tube angle and could cause the bike to ride funny and void your warranty. You should be ok to jump up to 120 or so but I would definitely check to make sure, first. You can find some smoking deals on high end forks on Ebay BTW. I know everyone is all about supporting their LBS but when it comes down to saving 300 to 400 bucks, its worth shopping around.