Welcome to the site.
RAM should make a mount for your 450. I use a 60CX on the KLR and for geocaching.
rammount.com has a excellent wizard for getting all the parts for your particular GPS and bike.
If you can buy a GPS cable that you can hard wire into the bike I would go that way.
I use the cigarette plug set up and have found that the plug looses its connection when you are riding on any bouncy stuff.
I have a Thermo-bob and wouldn't be without it. I ride in temperatures near freezing and the engine runs nice and warm. Before the Thermo-bob the gauge hardly moved when it was that cool.
Where approx. in Utah are you??
I suppose Moab is on your to do list. I hope to get to Utah some day on my Goldwing but I have a hard time with heat so it has to be early in the year.
I'll have to figure out how to do the hard-wire connection, because a lot of the places I'd be riding are definitely on the rough side. Lots and lots of rough places.
I'm about 35 miles southwest of Salt Lake City - with a mountain range (The Oquirrh Mountains) between the Salt Lake Valley and Tooele Valley. It's rather nice, because if I really need to go into the Salt Lake Metro Area, I can be there in about 40 minutes - but if I want to hit the dirt roads and get away from people, I can be there in less than 10 minutes.
As for Moab, the wife and I hauled our trailer there last spring and met up with my folks for about a week. It was around Spring Break, so it was quite busy, but we had a great time seeing Arches National Park, Canyonlands National Park (the part right near Moab, as well as the part down to the south), and Dead Horse Point State Park. We also hit up Fisher Towers - the tallest free-standing sandstone towers in the world - and areas along the Colorado River. After that, we drove a bit farther to the south and stayed in Bluff, UT where we were able to go out to Hovenweep National Monument - which was awesomely interesting if you're interested in Native American History. The ruins in that area are around 800 years old... That's also a prime area for KLR folks, because the roads to some of the areas are rocky, bumpy, dirt roads that require a high-clearance vehicle. And while we were in the vicinity, we also hit up Monument Valley, Goosenecks of the San Juan River State Park, and Natural Bridges National Monument...
It was a great Spring Break.
That was with our old camp trailer and before I purchased the KLR. Now I've gotta figure out how to take the KLR along with Momma's new 5th wheel hitched to the truck.