I now drive the SV2 but never drove the SV so cant comment on the differences as well as maybe some of the others on here can.
I have previously owned a DEX210 though and if I was to choose between the two then I would always choose the SV2. My reasons for this are simply that I find the SV2 easier to drive quicker, after its first run with no real modifications to kit set up other than my own choice of shock pistons and oils I was already putting in the same number of laps as I used to with the DEX210 which I had spent a lot of time on tinkering with it and trying to improve the set up to suit my liking.
Also I had to spend more money on the DEX210 to be happy with the car, things like the carbon fibre steering link, carbon fibre rear shock tower, Cream carbon fibre/alloy front shock tower, swapped from the kit ball cups and turnbuckles to Losi ones. I didnt make these changes for the 'bling' factor, but becasue the kit ones broke and so I replaced them with stronger alternatives. It is still early days for me and my SV2, but so far it doesnt seem to have so many little bits that need upgrading. The alloy hubs are one area that are worth upgrading though as the plastic ones are not the best.
If you are happy to buy second hand though then its well worth browsing the for sale area as many of the cars that go up for sale already have a lot of these modifications included.
To be fair though, there are no bad cars when looking at the racing spec kits (as opposed to some of the cheaper RTR's which need lots of upgrades) so choose the one that you like the look of, suits your budget, is popular at your local track etc etc. If price is a key factor though then for sub £200 then the DEX210 and SV2 get you a lot of bang for your buck. The X2C has less bling but will also serve you well and is only about £130 so there are plenty of options out there for good cars at the lower end of the market.
