These are the cheapest under 19lb 18x9 et45ish wheels I've found new for STH, FWIW:
https://www.google.com/search?q=konig+rennform+18x9+5x112~$210ea
and these are around 19.5lbs and et42 for $775
https://www.ebay.com/itm/4-PCS-ROTA-WHEEL-GRID-17X9-5X112-42-57-1-HYPERBLACK-LAST-SET/303308146483
These are the cheapest under 19lb 18x9 et45ish wheels I've found new for STH, FWIW:
https://www.google.com/search?q=konig+rennform+18x9+5x112~$210ea
and these are around 19.5lbs and et42 for $775
https://www.ebay.com/itm/4-PCS-ROTA-WHEEL-GRID-17X9-5X112-42-57-1-HYPERBLACK-LAST-SET/303308146483
Do you know if those clear BBK's?
Assuming you meant the Rennform.
I needed a 3mm spacer for ST40 kit. I think that was the shop playing it safe though, which is fine by me.
I will say, I was sceptical of the Rennforms until I actually got them on the car. Like most things, they look different in person. Not as flat as they look in pictures.
But wheels are VERY subjective.
What style wheel do you like and that might help us give s better recommendation
How many spokes
Split spoke
Lip or no
Etc
Outside of custom or expensive, you're stuck with:
Konig Rennform
Konig Freeform
Konig Freeform
Motegi M131 (I think)
Various Neuspeed (but not as light as above)
One more option I forgot about is Audi TTS wheels, but their offset is 52 so you'll need spacers.
I think it's these
Audi TTS
Edit:
Just went through my bookmarks as I looked everywhere for light 18x9. So here's a few more
Sparco Pro Corsa (done think they're light though)
Sparco Pro Corsa
Fast Fc04 (40 offset)
Fast FC04
Rota Grid (again, not as light)
Rota Grid
Can you post a pic of how much clearance you have?
Monkey, your response got me thinking about the FC04 in 18x9 ET40. Based on your experience with the ET45 Rennforms, do you think the extra 5mm of poke will make a huge difference on fender clearance?