Roger, lowering is a must for a wingless STi, otherwise it looks naked.
I have a Mines lip I still haven't put on, I'm leaning towards a Limited lip.
I also have a Ureshi carbon rear window spoiler (think Hamann E39/E46 piece) that I'm procrastinating on....I don't like the STi upper wing without the trunk wing, as they're supposed to work together. The longe rI keep the back clean, the more I like it.
I also have the stock trunklid/wing hanging in the garage should I decide to switch back. IMO, it makes more sense to buy a wingless trunk and get it painted and be able to swap instead of tracking down someone else's setup. One of the Sac guys is selling a PSM WRX-winged trunk in perfect shape, with full STi badging, if you want to split the difference and not go full wingless; I think he only wants $250 and I can put you in touch if you want.