I use the Garmin 200 and find it great. My pal bought a used 705 because of it's better functions etc, but I keep telling him that i don't need fancy electronics to tell me how knackered I am after climbing a big hill.
The 200 does give ft / mts climbed but I think it bases these off mapping. This along with the calories used is vague IMHO.
If you just want to set a route and follow the breadcrumb trail, the 200 will do that mighty fine for around £100 (new)
Comes with 2 x brackets as well for swapping between bikes
Regards
Steve