Best engine for aggressive, strategic and dynamic play?

I was thinking of purchasing a new engine to help with my long term strategic oversights.  I'm not worried about tactics as just about any engine can find just about any tactic.  I'm really looking for an engine with really good positional understanding etc. which makes sense for studying the middle-game.

I was going to get komodo 10, but I heard that Houdini 5 just came out.

Does anyone have any suggestions?

I posted before about trying to play like an engine, and I was advised against it. The people in my discussion believe that human coaching is better than engines. Perhaps its the same in your case as well. 

If youre looking for real improvement, you will need a human coach.  A human coach can explan the "why", while a chess engine cant, and generally players dont fully understand what +.04 means.  

It would be useful to get a coach, but it is difficult where I live, as well as the money.  I really just want it to point out strategical ideas (both offensive and defensive) which I may have overlooked.  I am not intending to use it to analyse my games, but just to point out things and to help my tactical/ strategic awareness.  I understand the reasoning behind why an engine is worse than a coach, but I think that an engine would be helpful.

Are you going to be able to understand the "why" behind an engines recommended moves?

To an extent.  The point of getting an engine would be to figure out why it recommends certain lines.  Of course it is better to get a coach, but an engine would be good nonetheless.

Anyway, regardless of the conclusion, which engine would be most beneficial?  They are all of similar strength, but which are the more positional and educational engines?