4wd
There's some good options these days. The B44.1 is very good, and durango 410 is highly regarded (and the atomic ultra upgrade just got released!). If you run associated 2wd you will be used to the hardware and the 44 platform is very good. Don't rule out the catsx3 either as I used to have the sx2 and the build quality and set up options were excellent. Some like 'shafty' some like belt drive, but have a think if you want to run stick or saddle as the rango and 44 are both saddle packs. Oh, and the cat is as well.
If you fancy something a little different and like the rich heritage and 'home grown' feel of British engineering, have a look at the Predator...they are super cool and have been used by some of the top lads with great effect for years.
Hope that helps a little
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