I was kind of lukewarm about any more of this game. I still haven't even beaten the main game. But Dead Money looks like it could be interesting.
As far as a discussion before about shops and getting good equipment, I second the notion that your best bet is just to find unique weapons. They are great and obviously don't cost you anything. I know I've sang the virtues of this weapon a million times, but Oh, Baby! is your best friend, especially if your character is geared towards melee. Hell, mine was more balanced, and it still kicked ass using it.