Cheers for the replies chaps.
Budget isn't too much of a problem, I don't mind stocking a few varieties and seeing what works, just wanted to narrow the choice down a bit.
Kourse Kings get a fairly good press wherever I look so I'll have to pick up a set of them, Bullseyes look like being a good option too and maybe grab a set of the HPI kit tyres while I'm at it just to throw some variables into the mix. Might as well concentrate on getting it sorted on Astro first as that's all I'll be driving on, for a while at least.
Thanks again guys, much appreciated!