I currently have a Klein Mantra Race. I ride intermedeate/advanced XC. I need to upgrade to a larger frame. I was thinking either an Adept, or an FSR. Please those of you who have ridden both bikes help me! I love Kleins, but they cost more. I want to get the one which rides better. I'll pay the extra for the Adept if it's worth it. Which should I get ?? Thank you for your interest.