I have a 60, love it. Havent tried the HCx
I bought a 4 GB memory card for $1 on eBay but the gps would only use 2GB of it, I think. I was still able to load high res maps for most of Wa, Ore, Id and N. Cal.
From the way people talk, the Colorado is better.
No matter what you will still need to buy the mapset after the GPS. Get that from eBay also. Get the older version, detail is nearly the same and price is half