I'd be surprised if the rad was at fault (Glycol issue). Wasn't it only certain rads in W203s/W211s etc that were affected - don't recall hearing of it on W210s.
A 2001 car shouldn't need a radiator for quite some time, I suspect it would outlast your tenure with the car.
Might be better keeping the £150 for the rainy day gearbox overhaul fund?
Will
Does the W210 has the Valeo radiator?