Dvx100b

your in luck. price just went down considerably

If you want to buy new, stick to BHphotovideo. If you want to buy used be careful. Probably stick to craigslist or ebay. Look for one with less than 50 hours on it. Less the better.

For accessories, traveling i highly recommend the Portabrace bags. They're very durable, lightweight and easy to carry. I have a pelican case for my XHA1, and while its unbelievably durable, it's impossible to carry anywhere. If you want a shotgun style mic, the Rode NTG-2 is one of (if not the most) popular midrange mic for the DVX100B and similar cameras. Definitely buy a few extra long lasting batteries. (If buying used, it often comes with a few) If your buying new, be sure to buy some lens filters to keep on the front of the camera to protect the lens. You want a 72mm set of Multicoated filters. Probably a UV and a Polarizing filter at least. These run about 30 dollars for a set of 3 assorted or so.

I'm sure i missed a few things, but that's a good start.

wide angle converter is always nice to have, essential for follow camming...and more importantly get a decent tripod, it's essential, and you'll be glad you didn't get a piece of crap cheap one. tripod is the easiest way to improve your filming exponentially, though im sure you know that if your looking into a DVX

if you have the money or time, buy/build yourself a 35mm adapter.

fucking right.

Don't waste your time/money building one, They don't work nearly as well as the pro ones do.  This is an expensive addon, but really a great one if you're willing to spend the money.