Lupo,
Here is my opinion, and only my opinion, on the TC30 vs. the TC33. My opinions are based on my observations, research, and tire kicking when I went to buy a tractor last year. I looked at both of these models, but bought a TC35 instead. I have 70 acres of land to farm, so I wanted a little more tractor.
The TC30 is the economy, no-frills tractor in the boomer line. It is a good, solidly made tractor, from my observations and from what others on this wonderful forum have to say. The TC33 is more styled with some bells and whistles. Are the bells and whistles important for you? Only you can decide that.
The TC30 for me was cramped when I sat on it. I am 6'1" and overweight, so my legs hit the sides and dash frequently when sitting on the seat. It was also inconvenient to get on and off of the tractor because of the transmission splitting the operator's area. The TC33's operator platform is open and you do not have to straddle the transmission when on the seat.
The TC30 has a fixed ROPS, and standard 3 point hitch lift arms. The TC33 tractors I looked at had the foldable ROPS and the deluxe 3 point hitch lift arms. How often will you need to get into tight places where the fixed ROPS will be a hinderance and a folding ROPS would allow you to go? How many times will you be hooking up implements to the 3PH?
In my opinion, if you will be doing some light to medium work now and then, then the TC30 with compatible loader will do it for you. It may take you a little longer using the TC30 than the TC33, but you can get it done. If you want to get it done a little quicker, have more loader lift capability, more lift capacity on the 3PH, a operator's area which is more comfortable when using the tractor for long periods, and you have the money to spend, then buy the TC33 with a compatible loader.
My final words of advise are what everyone else on the forum will tell you. Look both of them over closely, compare features and capabilities, and test drive each of them. Judge for yourself which one will fulfill your needs because you know best.