I'm in the market as well - my thoughts based on my previous grill. I last bought a 4 -burner char-broil commercial series from Lowes about 4 years ago for $350.
While the outside was mostly stainless, the inside and some of the body wasn't. I've already had to replace most of the interior components (flavor bars - typical, burners, etc). Now the pegs holding the flavor bars (and other parts of the body) are rusting out and there is really no way to repair it other than some type of "jimmie rig." And, it needs new burners again - the originals were supposed to be brass and last for life!
Anyway, I've decided to bite the bullet and just get the really flippin' expensive weber with stainless steel components, both inside and out - hopefully I can make that one last 10 - 15 years with only having to replace the flavor bars and maybe the burners over that time instead of other stuff
we'll see.