I've found that the time to buy equipment is after getting into a situation where you need it. I know, it runs contrary to being prepared for anything, but there are few accessories (I can't think of any) the lack of which will make you completely miss a once-in-a-lifetime shot. However, if you go ou tand buy everything you could possibly ever use now, you end up with an empty wallet and a lot of junk.

I was going to suggest a good tripod and a wire release, but I have no idea if you ever do any long exposures. If you're not into night or landscape photography, those might be a complete waste.

So keep your eyes open for limitations. Do you see a picture you'd love to get if only you had a _______ ? Then get the _______ and next time you will have it.

Another one that is often suggested is a flash, but that's another one that will be absolutely necessary or useless depending on what and how you shoot. I went eight years without ever putting a flash on my film camera and have used the popup on my DSLR only a handful of times as fill flash.

So my suggestion is, well, nothing. Go take pictures. When you feel like you need something to get the type of shot you want, then go pick on up.

And enjoy.