I want a mini too, indoors is not really an option unless I want to break thing around here.
Its a perfect size for my backyard though. I have something up my sleeve but here's my .02 -
Get it while you can, the Atomik Fiesta has been discontinued and going for $80 on Ebay. Out of all the car sort vehicles, you can setup it little track indoors and it will be okay. But because of its stock ride height you can run it outside, it will handle packed dirt, short grass and other surfaces pretty easily.
IMHO the La Trax Rally is set up for tarmac/hard surfaces (out of the box) since its slick tires have no tread whatsoever. Plus it comes with friction shocks out of the box, while the Atomik comes with ball bearings AND oil shocks.
That said its competitively priced if purchased at Tower with coupon code ($119.99). Hobby People stocks it for the same price ($129.99).
The Vaterra twins offer great value, the 1/14 is a bit off putting and I've seen people get them for $100, so while $118-$130 is a screaming deal, the cheapskate in me wants me to get it for the lowest price possible.
I like the Tacon Rally it has predictable handling out of the box and like the Vaterra twins it has standard hex's so you can run touring car tires and wheels on it.
Given these choices, even the Associated 1/18 scale cars, I would stay away from the Traxxas Rally. Jang was not the only person to find the road based 1/16 chassis has high CG and prone to traction roll with better tires. It can be tuned out of course, but the high CG remains. That said there's an excellent thread on RC Tech that covers all the mods you need to do in order to get the brushless to lap within a second of 1/8th scale touring cars around a track.
Its very hard to beat the Atomik Brian Deegan Fiesta for $80. Less than $80 for a hobby grade RTR car? Screaming bargain, oil shocks and ball bearings already in it. The Vaterra twins have these features to and have dropped about 35% in price from when first released.
I would say these would be ideal.
The LaTrax because of its low CG stock chassis and its optional carbon chassis upgrade will be the best on-road of the 1/18 scale cars and its cheaper than the Associated cars.
I am temped to get all three just to see what's up and sell whatever I don't want.