Here are some of my favourite fighters who hardly ever get spoken about but are dangers to ANYONE in their divisions:

Roger Huerta. Awesome all action guy,great to watch,explosive and tough as nails.

Ryoto Machida-the sleeper in the 205 pound division. Superbly skilled. Shut out after shut out. Great defence too which is rare,most MMA fighters are purely offence based fighters.

And I'd like to add Chuck Liddell has some of the best if not the best defence in MMA with regards to takedowns. I watched his whole career and I watch it over and over. IF someone takes him down,it was a great achievement! A victory in some ways,although the bastard would always get back up! I really like Chuck"!