The model type really makes a difference. Not so much with durability issues but how much you may end up putting in the sled after a few years. Take a look at the front shocks, are they Fox? If so, the sled is likely an RTX, this would be your best choice. The shocks on other models may or may not be rebuildable or " take-a-part" as some northerners call them. The rebuildables are worth it, as you can have the shocks valved to your weight and style, this is a must do for most all Yamaha's. For what ever reason there stock shock valving leaves a bit to be desired. The rear shocks on the RTX are adjustable so you can play around with knobs and ussually find something that works. Then at the end of the season, figure out what all of the settings are, determine what you want to improve discuss this with the shock builder and send them out. If the shocks are non rebuildables, plan on replacing them within a year or two. This will set you back anywhere from a few hundred for nice used ones to over a grand for new high perf.
Other than that the sleds are basically the same for 08'. Sorry for the dissertation, but shock packages are very critical, at least to me.
