MX5- I would also seariously think about looking into the SpeedMerchant Rev. 3 as well. The cars are rather similar, however there are some noticable differences once you get out on the track in some of the details of the car.
The CRC has a really high rear roll center (which can can lower by basically coverting it over to Speedmerchant side links), which does throw off handling, and I have seen and talked to the factory CRC drivers about this and they have done alot of hand modifactions in order to fix it on their own cars.
Also the way Speedmerchant's side links adjust are much smoother, more consistant, and less prone to tweak via an collision.
The Rev. 3 also has an adjustable battery tray so you can move your batts front or back, which does make a noticable difference in handling and is a great tuning aid.
No 12th scale (except the new relfex 12, although thats another story) comes with a bumper. To sum up alot of stuff I have said in previous posts... They snag boards, protect your car from stuff that it doesnt need protection from, break from hits the car can survive, and weigh alot (its like have alot of front ballast). There is no reason to run a bumper unless you want a tiny little foam one that doesnt extent beyond the chassis. (and BTW, i do run a bumper on my sedan, since they do work there, but not on a 12th scale). the Rev. 3 also comes with an antenna mount and antenna (sure about the first, 90% sure on the latter). Although its like $3, so it wouldnt be a big deal.
Also the Speedmerchant uses the Old style front end, unlike the CRC that uses the dynamic strut. The dynamic strut is normally used for mod nowadays, however to build one properly (ie so it doesnt bind, have wrong adjustments or any other issues) takes alot of time and knowing what you are doing. The old style is much simplier, less resistant to tweak from a collision, and handles the best in stock.
Also there is alot of really good information at www.teamspeedmerchant.com
about the Rev. 3 and a further explanation of its advantages.