just starting - mac vs. windows computer source?

Hello all. I don't know much about the specifics of a computer based audio source, except what I have learned looking thorough the archives. I am still hoping you guys can help me with suggestions that are specific to my situation and considering the current and potential future advantages of using either a windows or mac based system as a music source.

I have a fairly dialed in audio system (see my virtual system under mitch2) but want to now include a computer based source (I know, I am quite late to the party). I currently use a new(ish) windows based laptop for home computing, have external hard drives, and also have a windows based laptop for work. My only mac exposure is the company i-phones we recently adopted, my wife's ipad, and looking at my daughter's macbook pro. I have hundreds of CD's and a very high quality hi-rez player, but none of my music is yet digitized.

I want to add a high quality, great sounding computer based audio source that is at a similar sound quality level as my current player (or better), and I have heard using the ipad as a control and visual display, and the mac mini as a server, is a good way to go. I like the idea of having the mac mini near my gear, so shorter cables to the dac, and I like the idea of controlling everything wirelessly from the ipad, but this means I will need to buy more stuff and will not be able to use my windows based laptop for that function. I am okay with that as long as the ipad/mac mini is really a superior solution.

I have four questions regarding my decision to adopt a mac based or windows based music solution. At this point, I want to focus only on which computing system is best for me and handle dacs, cables, etc. later.
My questions;
1. is the overall consensus that the mac based system is better for hi-rez music playback, considering my goals are very high quality playback, wide bandwidth, low noise, and ease of operation,
2. is there a windows based system that could sound as good and be operated similarly to the ipad/mac mini option, perhaps using my windows based laptop as a control,
3. if I go the mac route, is there any advantage to purchasing a macbook pro over the ipad to control things, assuming I still plan on using the mac mini as the server, and
4. what other questions should I be asking that I haven't asked?

Thanks for any solutions or suggestions you guys care to provide.