Mountain Bike Framesets

Who makes the best frame for mildly larger guys riding on intermediate to expert terrain? [frame only]

 

Giant make some good stuff.......

You could also try someone who custom builds frames, IMO this is the best option if you're serious about cycling

 

Forgive me for asking but whats so good about custom frames? I have a Wheeler Mtb , It has a black solid frame and its solid as a rock and wicked on dirt i can do 73k on loose dirt going down a mountain and the bike is solid. any way id like to know what all this custom stuff is all about ;D