B5M by a country mile in my opinion. I actually don't drive one but my son does (14) and there are several at my local club. Possibly not the absolute fastest without some mods but fast out of the box, very easy to drive and spares are easy to get and cheap.
My son drove a B5M as his first ever 2WD at a national race at the very slippy Worksop on Jan this year and was not last
Having said that there are no real bad cars out there so the std advice is to go to the clubs you mention, see what is being driven as you will be able to get lots of setup advice.