I vote to leave this one stock so you can sell it easier and get the ideal bike for your riding style. Give it a few more rides as is. Maybe I'm just a terrible rider, but it took me years to feel semi-comfortable on a big bike when I couldn't touch the ground. It was a lot of frustration and wasted energy picking it up off the ground all the time on technical trails. If yo u're not riding technical trails, go for it. Riding is one of those sports where rider skill takes a while to get, but it makes all the difference in the world. Personally, I'd still be less exhausted on a lower bike, but if I were a fantastic rider, I'd be ok on a big bike. I'm not a fantastic rider, so I prefer the light, nimble, low to the ground bikes.