I got basically everything new for my first but things break or expire so I did buy items for my second.
New - Crib, car seat, stroller
I love my travel system stroller and have used it for years so to me it was a good buy.. Now I have known people to find great second hand ones too but I just figured it was a good investment.
If you do not check out Target Daily Deals I suggest you start. Just last week they had a bouncer seat for $18 shipped. If I was pregant I'd def. buy that. We got a fancy bouncer for our first and it stopped making all the lovely sounds and lights in time for the 2nd to use it so the 2nd time around I just got a basic vibration one.
2nd hand - Swing, exerciser.. things like that you never know if your child will like or not. A swing was a waste of money for us but who would have known. One child loved it and one hated it.
I personally would only buy a crib and car seat right now. I'd still look for great new deals and tape reciepts to things. You may very well be surprised on gifts you recieve. I personally do not like to buy clothes for showers and would much rather buy a bigger item I know the child will use more then a month or two. Also you may ge gift cards to put to these items.
Bumbo is also a great 2nd hand buy, those things are expensive. They are selling around 15 here on CL.