The Garmin GPSMAP 62s/62st is the replacement model for the GPSMAP 60CSx. Though I don't have the replacement model, what I do know is that my 60CSx proves to be a very capable and accurate device, even when I was trekking in the deep jungles of Brunei. Satellite acquisition is quick too, thanks to the high-sensitivity MTK chipset.
The replacement model should have no issues with accuracy, since it should be an improvement over the older model. But unlike the Oregon, there's no touch-screen in the 62s/60CSx. That's not a huge problem though, unless you are very used to touch-screen devices.
I believe it should be no less functional than the Oregon.
Only thing is the 60 series has an antenna and generally is longer and bigger than the Oregon.
Aside from the fact that there is no touch screen, which I prefer, what I understood from the sales people is that the 60 series has a hardier body and more rugged and resistant to knocks and bangs.
So it will be a decision for yourself based on some of these aspects.
The models mentioned above are designed for trekking. Garmin does have other models for driving though. You can also consider Holux (both Garmin & Holux are available from Eastgear) but I personally prefer Garmin. I am using the 60csx and agree with Scintillation that it is a very good and accurate trekking GPS. Now only if it has touch screen it would be perfect...