Personaly i would get an SSGT S1kit with a diff and get your own electrics to go with it.
The K153 package you refer to use's the older supastox chassis, so its limited in its future as it has already been superceded by the SSGT.
That's not to say it is a bad chassis its not ! just long in the tooth.
The S1 kit gives you a diff as opposed to the carbon kit that doesn't, so you will be able to race from build.
Though be warned there are a few upgrades to get it competative but your a long way from leading the A finals.
The kit is great, nigh on indistructable, and you will love the GT12 series, simple and friendly (or at least till your on the rostrum racing...
).
There is a great thread on here that well worth a read
http://www.oople.com/forums/showthread.php?t=165755
Hope this helps in someway,
Shiny.