Sandro Fouche , Jan 01, 2004; 09:15 a.m.
Most (all?) films with the term "chrome" in the name are slide film.
36exp almost always refers to 135 (ie 35mm) film. 120 film is a different sized film (6cm wide) that works in medium format cameras.
E6 processing is for slides.
C41 is the name for standard color processing, but you will find a few B&W films that use this process.
As far as which film to use, there are lots of variables in getting sharp shots, and you have not given us enough information to really help you. How large an enlargement are you after? What exposure settings do you normally use? With tripod or without? (I'm intentionally leaving out which lens you used, but knowing wouldn't hurt).
Considering you're new to photography, I'd look at your technique as opposed to worrying too much about film or equipment. Although I wouldn't necessarily shoot Superia, you can get acceptably sharp 8x10's out of it. The sharpest hand-held photos I've seen are actaully from marksmen; they are really practiced at keeping their hand steady. At least one I know commonly hand-holds a full stop or two below what I can reliably accomplish.