Hi,
Panasonic provides the most manual controls in their consumer camcorders. The GS500 is their best 3 CCD, SD, consumer model and fits your budget. Has manual control for zoom levels, shutter speed, focus, white balance, aperture, and gain, etc. The controls aren't quite as nice as the discontinued GS400, but still of current models in that price range it's probably the best.
It's a DV camcorder, so transfer to the PC will be via Firewire.
On the Audio side, it has a mic input. No line in however. (The GS400 did... also video in).
Good price here
http://www.purelygadgets.co.uk/showp...hp?prodid=1744
Actually looks like you may still be able to get a GS400 here
http://www.thehifistore.co.uk/eshop/...s/NVGS400B.htm