You should thing about what is the bigger size you might need.
If you get a small printer the maximum size will be up to 8.5X 11. With a wide format printer you may print larger transparencies for larger designs.
I know some people says that you print in more than one page (with the smaller printers), and then combine them to obtain larger positive. But it might work just for hobbyist.
I just bought an old wide format printer off craigslist, it is a 13" wide. I will use it just for screen printing.
I am going to order UV blocking ink from inkjetcarts.us and fill all the cartridges with it and see what comes out.
Good luck with your purchase.