I've been using a Rode VideoMic Pro as a camera top mike, works well and there's an inexpensive wind jammer available.
Got some amazing results in demanding positions.
When working with a boom pole mounted mike and no dedicated sound recordist I've been using Rode NTG 2 (normally with a Sennheiser plug on transmitter and a receiver on the camera). This way journalist, reporter or producer can roam with the mike on a grip free from cables. It would also be possible with a little ingenuity to adapt the Rode VideoMic Pro to this as it has its own built in shock mount.
I think I chose the Rode VideoMic Pro over the Sennheisser MKE 400 because of the quality of the shock mount systems, the mics are similarly priced and in performance quality.
When I was shopping for inexpensive mics, my three choices were the Audio-Technica AT-897, the Sennheiser ME66, and the Rode NTG 3. There are countless shootouts on the web between these three mics, and after a lot of thought (and listening) I decided on the Rode for its fuller sound over the Sennheiser and AT.
Do a search on the Google for "NTG 3" "me66" AT897 comparison. You'll find a ton of blog posts, forum posts, and shootout videos to help you make your decision. Here's one good link to get you started: