Myself, I like the idea of getting refurbished equipment. But that is a personal thing. Many Mac owners have pride in having the newest model. If the machine was rebuilt to Apple specs and if it has a warranty, it may be a good value.
The Enterprise edition of Windows 8.1 is now available for evaluation from Microsoft. You have 90 days to decide if it is right for you.
Did not mean to scare you with my remark about limitations of running Windows 7. Microsoft is going to short change the support for Windows 7. And to get the most from Windows 7 you would run the 64 bit version, which means the old DOS games with not run or only with some emulation. This is true of Apple and PC machines. The 64 bit system does not run native 16 bit code.
This has been discussed elsewhere extensively. Here is what they say on Ypm's Hardware. As I mentioned, it is not a n Apple issue, it is a 64 bit issues common to 64 bits OS. Very old MS0DOS games require emulators.
http://www.tomshardware.com/forum/7161-63-game-windowsOf course, this also applies to Windows 8.1 as far as I know. And I doubt MS will ever change that. There already are free emulators out there for MS-DOS.
There is a similar issue with old programs that do direct hardware reading. In particular games that want to go directly to the sound card. Again., that is true for both Apple and PC machines running current versions of Windows.