its finding a set thats the problem. new sets are like hens teeth, and second hand sets are few and far between, then you got the price issue. average second hand sets go for between £150 - £200, and a lot of the time, the lenses need replacing as there prone to rusting, and genuine lenses are about £70 per lens, and there are 4. you can get around that problem, and buy cheap halfords lenses at £22 for 2, but they look awful.

if your not confident about doing the black eyes yourself, you could buy a set thats already been done. there are plenty about, and a set can be had for as little as £40, then you got your standard lights as spares.

as for lowering, mine's -35mm all round, the front isnt to bad, but i cant reverse into spaces with reasonable size kirbs, because my rear bumper catches, and unless i crawl over speed bumps, at a certain angle, my exhaust catches on them.