The cheaper option is just another set of standard 16" rims
do a search on any of the main dismantler websites, or
Will Tilery does good deals on used rover parts, he can be found on Dweb, just PM him your requirements
I have one set with road tyres and one set with offroad tyres, I think Will charged me $ 275 or similar for a set.
he's supplied me a range of parts, and arrive as described for a fair price
Obviously if you can find them locally...its cheaper
Steel V's Alu.........really for everyday general offroad use, there's not much diference
If you intend to drive a fully loaded 110 1000's of miles along unmade roads.....maybe the price is worth it...