This is one of the best mATX options out there. And by "venting in the front" I assume you mean a mesh front panel for full flow intake? Because, front mounted fans should NEVER be "venting" anything. They should be intake fans, bringing air INTO the case, so that the rear and top exhaust fans can carry heat out, and the front, side or bottom fans can bring fresh ambient air in. Just to clarify, so there is no misunderstanding.
www.fractal-design.com
Fractal design is absolutely one of the top three case manufacturers in terms of quality, features, aesthetics and most importantly, customer service and support, if there should ever be anything wrong with the case or it's components.
Most of the top case designs these days will be either Fractal Design, Corsair or Phanteks, with a smattering of other models from other manufacturers here and there that are pretty good like a few from Lian Li, Be Quiet, Cougar, Silverstone and even a few decent models from Rosewill. But for mATX options, that is probably one of the best right now.
The H510 is not a microATX (mATX) case, it is a mid tower ATX case. The Corsair Carbide 275r is a mid tower ATX case as well. In fact, all of them are, because the P300A is as well. None of those are micro ATX cases, so are you SURE you are looking for an mATX case, or just a mid tower ATX case, because the differences are pretty big, not least of which is the fact that an mATX case cannot support a standard sized ATX motherboard, only microATX and usually also mini ITX motherboards.