I personally don’t like the Lenz Design body kits - IMO it makes the car look as if it’s been driven through the local Halfords branch. That’s just my opinion though.
I’d always keep any body mods very subtle as I prefer the OEM look, which would probably mean I‘d stick to OEM seat parts only. I might consider non OEM alloys though, but I wouldn’t get diamond cut / machined alloys as they’re susceptible to white worm corrosion.
@Jw1994; assume you’re car isn’t leased or being bought under a PCP. If it is, then it’s probably worth checking the small print in your lease / PCP agreement to see if modifications are permitted. If they are, I dare say you’d need to put the car back to stock at the end of the lease term and with PCP if you‘re planning on handing the car back.