If my laptop was older, I'd get a Microsoft surface pro pretty much right away. I think it's probably the first tablet that I think could become the single computing device I take with me on the road.
Since my laptop still works just fine though, I'm waiting for the next gen ipad and will probably buy one of those 32GB or 64GB versions, since I filled up my 16GB iphone pretty much the first week I had it. My wife already has an older ipad and we like it, but apple sets it up to be kind of difficult to share an ipad with someone. It gets weird trying to sync it with two computers and if you push the wrong button you can lose purchased items by accidentally connecting it to another apple ID through itunes. The ipad can't replace my laptop, but I don't need a laptop replacement yet. I've been very impressed with the Microsoft tablet but you gotta get the pro version and it's kind of expensive. You certainly get what you pay for though, both with the ipad and with the Microsoft tablet.
Since I have an iphone that I can use to share data with for not much $$$, I will probably get the wifi only ipad and save about $150...