A 60CSx is much the same as an Etrex Vista HCx. It's not worth changing.
The Etrex version is a bit smaller, has a slightly smaller screen, and the battery lasts a bit longer. The 60CSx has a few features the Etrex doesn't, most of which are irrelevant when walking.
The base map that comes with it is fairly useless, even if you have the Europe base map rather than the US base map. They have not very accurate M, A and B roads only. To get more, you need to get proper maps, which must be Garmin compatible.
Your options are:-
a) City Navigator - This is roads only, but pretty much all accessible surfaced roads. It's approx £45 UK & Ireland on SD card, or £90 Europe on DVD. With the DVD version, you copy data to an SD card. It can also be used on your PC for planning or route review, and also you don't run the risk of corrupting the card and losing all the data.
b) Topo GB - this is Great Britain only, and costs something like £100. You get roads, 10m contours, some paths and tracks, most watercourses, and some areas of woodland. There are equivalent products for some other countries, such as France.
c)
OpenStreetmap. This is a wiki, with the map made up from open source data such as out of copyright maps, the NASA Space Shuttle radar data for contours, and a whole load of people's GPS tracks. It's patchy, but where it's good it's better than anything else. Check the online data linked above to see what there is for where you want to go.
If you want to use it, go to http://yacf.co.uk/forum/ (cycling forum), and look on
andygates' sig line for an up to date download of UK data.
There is no possibility of using OS maps. You'd need to get a recent model, such as a Dakota or Colorado, and pay loadsamoney for the OS maps. I reckon you'd be better off with a SatMap, or even a suitable phone.
