Swapping out for the 2.5L engine wouldnt be a good idea. They probably a couple thousand to buy, plus all the work needed. I would say if your set on that engine, then sell your car. I have a 2000 SE with a SR20 engine. This swap cost less and is a more "bolt-on affair" but my advice to you is dont spend your money on QG18 upgrades which will net you hardly any HP. Sell the car if your looking for speed. Thats all there is too it. A GXE with 2k in upgrades will still be slow at the end of the day. Thats all there is to it.
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