[Si Coe]

Actually upgrading an RTR to almost V2 spec can be done pretty cheaply indeed - provided you stick with the plastic chassis.
You'd be right that normally its not the case but with the RTR so insanely cheap you are basically talking about a new RTR chassis for the same price as a used V1 if you discount the cost of the electrics.

The 210 is a great starter car - I think that forward motor 4wd based cars like the TM2 or KF are ultimately better on UK tracks than conventional 2wd like the 210 but they aren't beginner friendly.
Get a 210 RTR, run it pretty much stock and then flog it for a TM2 and some better electrics later.

Oh and spares shortages? Rubbish! Never had a Durango (210, 410 or my 210/410 hybrid) sit on the sidelines due to lack of spares. I might have to check a couple of different shops but I can always find the part.