The Ultra is a good choice. Just make sure you can get some parts (mainly arms, arm mounts, hubs, shock parts and towers) locally for whatever car you end up with. Not all LHS's can cary all the 1/8 kits and parts. Waiting for a part to come in the mail cane be a major pain in the azz..
Buddha Tech Race Services ~ Build-Prep-Tune
buddhatechraceservices @ gmail . com