I just recently took a trip from Saskatchewan to Phoenix using Holux GPSlim 236 GPS and iGuidance maps. I paid $90CAN for GPS receiver off ebay from a seller in Ontario and another $125CAN for iGuidance from
here . This combo served me well.
Oh yeah, might not hurt to get external memory to store maps on. I think the map that I created, which included SK, MN, WY, CO, NM & AZ was around 10meg.
Okay, while I'm at it. Make sure you have external 12v power supplies to operate Ax and GPS on. I get about 10 hours constant use of GPS and only a couple of hours on Ax.