Well, first I'll compliment your good taste; original controllers are the way to go.
Secondly, there are basically two options: One is more of a traditional "hack" and the other operates mostly on the software level. The former may be done a variety of ways but is most often achieved using the parallel port. Such a hack involves the use of a circuit that can both interpret
and convert the data sent by the SNES controller, so that the parallel port can access it using
special drivers. In addition to the parallel port, and interesting option would be a
keyboard hack.
However, if your balls cringe at the thought of doing the drudge work of hacking--disassembling, soldering,
testing, etc--USB convertors are the new fad. You can find them in a lot of places, particularly for the N64. Here's a
link that I snatched with a quick google.
Oh, and don't worry about being accused of not doing research: This site is virtually devoid of any useful console info. So, good luck! I hope you get things the way you want them to be.