I would go with the XQ2S of all your options.

Since you're starting out new is better than secondhand, you build it so know how to fix it. If you go to the club and buy off someone there who will then help you then secondhand could be better for a first timer. Talk to the club members and theyll point you in the right direction as there are always those members who upgrade every week and you get good deals secondhand.

At my club there are many with both the Sakura and Xpress and the Xpress cars don't break. I have seen a lot of dnf from the Sakura.

Whats your budget? I bought a Tamiya TA07Pro first time round and now that I've spent enough it hangs with the fast guys, but resembles a TA07MS. I should have bought a TRF419XR (TRF420 now) at the start and would have had the right car from the start. If you can stretch to the XQ10 then get that, it needs no upgrades and will be better. It doesn't save money by buying cheap to start as you spend the money later. I think the XQ2S is different to the TA07 but you will end up spending more as you go. If you get the XQ10 there isn't much you can spend as you have the best from the start.