Lens or Camera upgrade (or both) advice needed

[peggary]

I use a Canon Rebel 2Ti and a Canon 50mm f/2.5 compact macro lens, with a Manfrotto tripod, center pole inverted, on a tabletop in outdoor natural light.  My camera points directly downward to capture an approx. 1.5x2" area of a relatively flat surface.  (1) what Canon product, lens or camera, do I need to improve my ability to capture an even smaller area, or the same area with greater clarity to allow me to crop to a smaller area, and still enlarge to produce, at a minimum, a excellent 13x19" print  (2) same question with the goal of a sharp 2x3' print and (3) if your recommendation is for both camera & lens upgrade, and I can only afford one, which would get me closer to my goal, for my buck?  

[peggary]

Thanks.  I left them at my summer place in MA because I never use them, but I suspect  they don't have electronic contacts, so I appreciate your pointing that out.  I plan to link up with some Camera Club folks in the next few weeks and they may have some, as well as other equipment I could try out.  There no longer are camera shops locally where I can rent equipment to try.