A: The Dell 8900 will accept up 64 GIG of RAM. However, unless you are doing serious amounts of operation which require tons of ram(video editing/rendering, CAD work) much more than 8 GIG of RAM is a waste of
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A: Yes, all new and Dell refurbished desktops are supplied with a wired keyboard and mouse.
Personally, I prefer a wireless keyboard and mouse. My absolute favorites are Logitech's K800 backlighted keyboard(the keys light up as your fingers near the board and their(Logitech's) MX Master wireless mouse in black. The MX Master mouse is so full of features it took me days to figure how each functioned. One note of caution, however, the MX Master is on the large size. Therefore, try it on for size and be certain it's comfortable before Best Buy's 14 day return period has run out.
A final thought. Best Buy, Dell and Logitech each have excellent customer service. Great service from the manufacturers(Dell/Logitech) and seller combined with Best Buy price match guarantee is a tough combination to beat!