If you just want one to see your route, and don't need all the audio extras, you can save alot of money by getting one of those "old school" things they call a MAP. Gas stations still sell them. Buy yourself what ever states you need. Buy a highlighter to mark your route. Fold the map so your route for the day is on top facing you and stick it in a ziplock bag that you have taped some refrigerator magnets to the inside corners.
This will stick to your tank right in front of you. The display will be alot larger than most GPS screens you can find. You will have to occasionaly stop and re-fold the map , but it is alot easier to see your route than looking at a tiny screen. (which really is a bit dangerous to do while riding anyway...you really should stop to study either )
No radio or bluetoothed phone, but you can get the whole set up for under 10 bucks.
KM