I've done a few weddings for friends and I shot them in RAW. I shoot everything in RAW, and it sounds like the OP does too, so why would I suddenly close down my options for someone's important pics, and on one of the couples most important and stressful days of their lives?
I wouldn't, especially if I were also getting paid for it. Like was mentioned earlier, if you feel you will need time to edit any images you take, factor in the time to be reflected in the price you charge.
When it comes processing, retouching goes beyond basic colour, exposure and cropping imho, depending on your work flow, it need not be a lengthy thing to do. And as with any editing, be it Jpeg or RAW, you don't have to edit every image, you just have to edit the images, if they need editing of course,
that the couple will be given.
In the overall cost of Photography, memory cards are barely a consideration. Cards, especially SD cards, get cheaper all the time. In 2003 I paid £150 for a 1Gb CF card.
You can now get a 32Gb card for about £10, and no doubt the prices will keep falling. So more memory cards are nothing if you are taking this seriously in any way.
That said, I would disagree with what people have been saying earlier in this thread in regard to getting very large capacity cards. If I were doing a wedding, because my camera has dual card slots, I would get one large card as a backup in the extra card slot, to backup all the images throughout the day, but I would have cards with a capacity of 300-400 shots in the main card slot, changing as I went along. I've had cards go bad in the past, though not for 7-8 years, until the other week when I lost a couple of hundred shots on a card whilst on holiday. No sign of any problems until I tried to put them into the computer.
Unfortunately that was in a camera with just one card slot.
Luckily the images from the previous days had been backed up onto my laptop each night, so the loss could have been a lot more. That could happen at any time, to anybody, with any camera, don't put yourself in a position to lose too many pictures in one go.
There are different types of Professional Photography, and one of the things to consider when attempting to be a Professional means trying to do things in the most cost efficient way, the saying is 'time is money'. But in Wedding Photography in particular, you make your savings by being efficient with your time, which only comes from experience, you don't scrimp on anything that can put the image capture and the results in any peril. Imho. That is an area that some starting out don't place enough importance on. A good Pro Wedding Photographer will have back ups of most of their gear, and/or have strategies in place to work around any problems that occur with equipment.
