The fighter for me is the baseline class. Once you have the basic fighter down pat then you can start worrying about making other types of fighters and other classes.
To start with Spells and Swords will be compatible with 2nd edition partly due to the fact I'm playing it right now, but also due to the amount of material available for it (also part of the reason I'm playing it). It's also the least problematic of the traditional classes.
Here's my version of the fighter:
Check out my 5th Edition Blog.