You could also look at the NTG-2 from Rode. It's just like the NTG-1 but can be battery powered as well, so you won't need a mixer and phantom power source (which can really bring up the cost). Unclebob actually recomended that one to me and I ordered it. It will be arriving at my house sometime today.
Just so you know, buying that microphone (and shock mount and 1.5' cable in a kit from B&H), getting long XLR cables (20' and 50'), a boompole (DIY from the link Unclebob suggested), monitoring headphones (Sennheiser HD-280 Pros, 60 bucks from ebay), a Beachtek DXA-4 XLR adapter (because my camera doesn't have XLR input, yours may) all cost me around $500ish. I originally thought I would be able to do all that for around $150-200, but Unclebob explained to me why I shouldn't skimp on sound and once my microphone gets here and I can start playing, I'm sure I won't be dissapointed. I haven't got an omni-directional mic yet, as my next 2 projects are 95% outdoors, so I'm waiting a little longer before buying that, but I will be buying that at some point.
One thing to keep in mind, is that sound is often considered about 70% of a film, with the editing/acting/film/etc being the other 30%. So basically, make sure your sound is good quality because that could make or break a film.
Unclebob sure knows what he is talking about and gives some great advice.