grand piano

I'm in need of some advice. I've recently taken a piano faculty position at a University, and have been given quite a bit of funding to use as I see fit and I'd like to dedicate a portion of it to a decent 2-mic setup. As a preface, I would like to say that we have an excellent engineer who has a ton of experience and an awesome equipment list. He's also a very busy man, and I don't want to bother him every time I want to do a bit of recording, especially since I tend to record at odd hours. To be clear, I do have plans for a solo classical album, and I will be exclusively going through him when I record it.

My audio interface is Sound Devices Mix Pre 6 and it records straight to SD. I want to record my Yamaha C3E grand piano in a way that I won't ever need to go to a studio. I currently use Zoom H2n. I want to record 4-8 hours per day. Solo, duets, four hands etc. I have a list of microphones in matched pairs (many of them are stereo too). Which one will give me super professional results? Keep in my mind that my room is not treated so I need something to cancel the room as much as possible.

I'm currently attempting to record a grand piano, and have run in to a few little hick ups. To give you an idea of my set up... I have one Shure SM81 mic which is running through a lower end M Audio interface. I wish I could record it in stereo, but this is all I can afford at the moment. So I feel like the sweet spot is with the mic pointing straight down at the mid section of the piano (lid up)... So far this gives the best results tone-wise. The problem with this spot is that I am picking up big time noise every time the pianist pushes the pedals!