I've got the R version of the Yamaha, and its my only vehicle. Its quite comfortable running 70mph all day long until you get tired of putting gas in it. I had 17k+ on my first one before it was stolen, and close to 11k on the current one (since late january) and all I've ever had to do is put gas in it, change the oil, keep the air filter clean, and keep tires on it.
Not sure what mods you're looking for in addition to the numerous pipes, programmers, the two different big bore kits (one's even a GYTR part), two big tank options (3.1 IMS, 3.5 Safari, soon a 4.5 IMS), and suspension bits from Race Tech. There's even a freakin turbo kit lol.
A friend has a KLX with a 300 barrel on it, and its close to my bike's stock performance. It is significantly cheaper as well. But it can't run electrics like mine can (GPS, heated grips, heated jacket socks and gloves). And I never have to mess with jetting (fuel injection).
The WRX is better but more expensive. The KLX is cheaper but pretty close in performance. Can't go wrong with either.