What do you guys think about one of these?
Serial Interface Board Module
I also like the db25 cable. Are there any other cables like that with less pins? I suppose USB can work too (for temp and float sensors).
Edit: Nevermind. I just saw that there's DE-9, DA-15, DC-37, and DD-50 cables.
There's also breakout boards for these! Nice! (For anyone else interested)