1. If you buy a set of 33" tires (and wheels with about 4.5" of back spacing) then you won't need wheel spacers. Check out discount tire they're ontheforum and typically give screaming deals. Also if you're considering Goodyear Duratracs, I believe they are still offering a 100 rebate through treadlightly. Personally very happy with my Duratracs.
and I wheel a decent amount.
2. No you won't need a lift, I would suggest you get a leveling kit though. The leveling kit will provide you with a bit more clearance and more capability with the larger tire off road.
Hope that information helps you out.