Jonathon beat me to it- Vancouver to Okanogan is about 400 miles. That's an expensive trip, unless you drive a Prius. And even then, you'd probably only get to go once. Being new to hunting, I'd think you'd want to gain a lot of experience. Hunting close to home would allow you to get out a lot. You would be able to scout prior to the season. Personally, I get a lot more enjoyment out of hunting when I'm able to scout and come up with a plan on how to hunt an area, rather than relying on luck.
If you're limited on how much you can walk, and you're on a limited budget, the St. Helens permit is just what you need. Other areas that are open to everybody will be crowded and to be successful will require you to out-walk many of the other hunters. It can be done, and you could just set up a ground blind and sit all day, and you could have success that way. But I really do think the $160 would be money well spent in your case.