I ride a 525rs, mostly offroad. I have ridden it to work a few times (64 miles rt), I perfer to ride my 950 to work. It's way more comfortable both physically and mentally. The 525 has planty of hp for the freeway, it's just so light you don't feel as though you should be out there with the cars and trucks.
I ride the 525 everywhere offroad, from Baja to Sierra single track and everything in between. I'm pretty big, 6 ft. 240 lbs, if you're smaller you may like the 450 better, but the weight is not much different. It's a great bike offroad, I don't think you'll be disapointed with either one.