Scott, these guys have given you some worthwhile info. I would like to add one thing. If you can afford it, don't get rid of the trainer. No matter how far you advance, there will be days when dragging out a slow, stable aircraft and just puttering around the sky or shooting a 100 or so touch and goes will be the best therapy you can find.

Not to mention that you will have the perfect airplane to introduce someone else to a great hobby.

Out of all the advise above, I think the most important (other than safety) is being perfectly comfortable with the orientation of the craft.

Ed M.