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Dean, it's senseless to film anything in standard definition anymore. Every company I produce content for- both online and for offline wants hi-definition. It's mostly for marketing purposes, since they can all advertise "High Definition" on their tours for example. And don't forget, surfers will start to expect hi-def more and more, even if they only know by the wide screen aspect ratio.
Going forward, you or your clients will be able to repurpose those videos for HD-DVD, Blue-Ray or tv broadcast which you won't easily be able to do with SD footage.
The most economical way to get into hi-def is with an hdv camera like the the Sony FX-1. There are many easy desktop editing solutions for HDV. And a fast computer like the Core 2 Duo series will at let be able to encode the finished video files at a reasonable pace, although still much, much slower than than standard def.
True HD cameras that record to P2 cards or hard drives are starting to become much more affordable, but it takes a LOT more computer processing power and hard drives like Raid setups to edit and render these files. There is a very small difference in the attributes of HD vs hdv, such as the 4:2:2 colorspace but its hardly worth it for the extra expense and trouble just to film porn, especially for the web since the end product is extremely compressed anyway. So unless you are producing something that is really high end or you have a lot of money and time to spend on mastering the technology ,an hdv is probably the way to go, like the Sony or newer Panasonic cameras.
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