Thank goodness for the wife. You're going to have great fun with your new camera! The Canon shoots more like a film camera than most of the other cameras, so you can avoid many of the problems with digital, such as shutter lag, etc. The Canon lenses are the fastest in the biz, so that will help you as well.
Nice selection of lenses, as far as I can tell. As stated earlier, the quality of the lens is the key, especially with film, but also with digital. But the processor is also a major factor in digital, and Canon is one of the best. You're going to want to protect those lenses, so those filters will come in handy. The great thing about digital is that you can manipulate your images to do whatever you want, whether that be to make them wildly spectacular, or just get them to look like you invisioned them when you shot them. Therefore, filters are basically unnecessary, because you can get the effect you're going for in photoshop. But....a polarizer will cut down on the glare that can ruin a photo, and which is tough to get rid of in PS. The most important thing is protection for your lens. If you scratch the filter, you can easily buy a new one. Scratching the lens itself becomes a pricier misfortune. The rest of the stuff is really easy. Photoshop elements will have everything you need, and it will probably come bundled with your Canon software. Have loads of fun!
IMHO, it would be too counter productive to shoot in RAW, especially since you are a newbie. As mentioned earlier, RAW take A LOT of memory, as the file size is huge. To manipulate the images takes much longer, especially if you have a slow machine. You do hae much greater control over a RAW image, so if you want to frame or blow something up, you might consider using this mode. I really wouldn't use it for snap shots though.
As mentioned earlier, snow is tough for focusing, and it also easily fools the sensors. Experiment all you want. You're not going to be wasting film. One thing you will wnat to have absolutely correct is the white balance in snow. You can correct this in PS as well (and this is a situation where RAW come in mightly handy), but better to get it correct right off the bat.
Be aware too that condensation will ruin a digital much easier than it will a film camera.