unless your going playing in the mud, then i personally don't see the need for mud terrain tyres
i do a bit of green laning, and the bfg a/t's were more than enough to deal with anything in my area,
that being said i have got some 31's on my maverick now only to gain a bit more ground clearance - bottom of truck scrapped in a few areas. :augie
i used my bfg a/t's in over a foot of snow (long time since we've had that much in this area (n/w lincs/notts) - so i would reccomend a decent all terrain tyre for use all year round
bfg aint bad but are pricey - can't fault the general grabber at2's - mate had them on a frontera, made loads of difference green laning, there are other tyres which are more road biased, but really depends if you want them for bad weather or you plan on going mud pluggin' at the weekend :thumbs
my experience of mud tyres was on a suzuki sj (not exactly the most quiet vehicle) but they were noisy on the road - mind you it was a rag top, with no carpets/sound deadening etc so mabye that didn't help :augie
just my opinion anyways