as for the revo i can comment on that as I've never had/drove one but they are a good truck. but I've heard the diffs are like choclate
What the hell does this mean?
As to the original question, my first question would be, are you looking for a monster truck, a 4WD stadium truck, a 2WD stadium truck or a buggy? I know you said "nitro truck" but I do not want to make any assumptions.
As for monster trucks, you've heard Savage and Revo; both solid trucks right out of the box with lots of stock and after-market parts. The Savage is generally considered to be the "tougher" of the two for sure, but owning both, I can say the Revo is a solid truck as well. The Revo is considered the "ready-racer" of the two, so it depends on what you typically will be doing with it.
Some other great MT's worth mentioning are: the Team Associated MGT, the Losi LST2 and the XTM Mammoth. All, in my opinion, are solid trucks with a lot of options. I know of several members here that have purchased the XTM Mammoth and made it into a solid truggy with a few modifications.
Now, there are a few 4WD 1/10th scale stadium trucks as well, notably the HPI MT2. These guys don't have the girth of the MT's, but can be loads of fun all the same.
The 2WD stadium trucks, like the
Team Associated RC10GT and RC10GT2, HPI Rush Evo and Traxxas Jato are really fun tracks trucks, but they will not do so good in grass or on really rough dirt. I have the 10GT and love it on the local track, but just messing around in the yard, it's kind of a dog.
Buggies are a different breed altogether, so if that is route you are considering, I suggest searching the buggy forum for some insight.
Bottom line, pick something you like, no matter what anyone says! Ask some questions, take the opinions then form your own opinion. Most important thing is to find something you'll enjoy!