I just think 33's would look to small with a lift but thats just my opinion. I had 33's on my 02 with a leveling kit and felt that 35's would have looked a lot better.

 

A lot of it depends on whether it's a 4x4 or 4x2. Also, the brand of tire makes a big difference. More aggressive tread makes a tire appear larger and some manufacturers REALLY inflate the listed tire sizes. I've seen "33"s measure 33" and I've seen "33"a measure 31 1/2".

This is a former member's 4x2 Ram I helped or did almost all the work on with 5" of total lift and 33s (Nitto Terra Grapplers that actually do measure about 33") and I don't think it looks bad at all:

 

the width plays a big factor in it to. If there really narrow tires it makes the tires look smaller then if they were wide.