Go on without iPad, Get 2nd Gen or wait for 3rd?

It all depends on what your plans are for using either an iPad or a Mac
Both are excellent devices, but they don't do the exact same things
What are your needs?

 

I agree. What are your plans for using it. If you're in the market for a new home computer, then go with the Mac, either a desktop or laptop.
An iPad is a portable device that can do different things, like iBooks, that is not available for the Mac. iPad would be better for reading.

IMO an iPad would not be a replacement for a computer.

 

It's rather hard to give you an advice. I've seen a few who thought they wanted it but ditched it after getting MacBook Air, and I've seen others who thought they didn't need it but now can't live without it and rarely use their big computers/laptops. Give it a try, maybe even a used iPad 1, etc, and see if it fits your wants.