Well, what do you want to do now?
>Buy quality items that are light that you will not need to replace, based soley on our suggestions?
>Or just get decently light items for cheap to get you back into it, then replace items as you get the money and knowledge of what works for you?
From what it sounds like, it seems you are saying the latter. If that's the case, then I will second EVERYTHING Ian said. I actually have that tent I picked up to replace my quarterdome, just seem seal it good.
I would only add, that you can pick up an older external frame from craigslist for $20-$30. This will make carrying what is likely to be a heavier pack more comfortable until you start spending the money to lighten your gear list.
I would say, right now, use your REI dividend on a stove or sleeping bag, but I would save it for next year, until you figure out what works for you and have a better idea of what you want before spending $400 on a sleeping bag, just to find out you prefere a quilt.
Personally, haveing gone through spending $$$$ to get into backpacking, just to realize that what I really want out of my gear will cost me another $$$$$$ to replace what I am using now, I totally suggest getting in as cheap as possible, and spend your time researching, saving, and hiking.
After hiking, you will know what you want each piece to do for you.
After researching, you will know what is the lightest itteration of that piece. Finally, after saving, you will be able to afford that piece.