I'm planning on using an ext recorder (either the h4n or the dr-100) and just clip it onto my belt, but i was wondering if i could mount, say, a rode ntg-2 onto my t3i w/ a shockmount for run n gun projects. Any responses would be most helpful 

1) If I were to go the shotgun mic route, are the rode videomic pros any good? Especially compared to the NTG-2?
2) If I were to go the lavalier route: any lavs on a budget with a solid reputation?
3) Is there a boompole that is attached to a tripod? So I could just set it up and not need a boom op.
i was just planning on using a forty dollar pair of sony earbuds. is that asking for trouble?
Thanks, thats great info! I wouldnt mind kicking in the extra 80 or so dollars if the ntg-2's quality is noticably better. What about the vmp would make it better for me?
also i was just planning on using a forty dollar pair of sony earbuds. is that asking for trouble?
Hopefully, just one more question: you said that forgoing the boom mic op and mounting directly on cam would be a big mistake. Is that just for shotgun mics or just in general? The cam/subject would be stationary in this project I'm thinking of taking on (just an interview). I'm thinking of getting a boom/boom ops for other projects further on.
That makes perfect sense. I suppose if I do go w/ the VMP, then I have a little wiggle room in my budget for quality headphones. The VMP sounds like a great baseline mic to grow from.
Hopefully, just one more question: you said that forgoing the boom mic op and mounting directly on cam would be a big mistake. Is that just for shotgun mics or just in general? The cam/subject would be stationary in this project I'm thinking of taking on (just an interview). I'm thinking of getting a boom/boom ops for other projects further on.
The "standard" are the Sony MDR-7506 headphones, about $100. Quite a few professionals use earbuds, but they are about $400 a pair, have extended frequency response and are custom molded for the user; they wear ear protection headphones (like on a weapons range) over them for the extreme isolation. The idea is you want to accurately hear what is being recorded while being isolated from the outside sound.