New on here and must say its a forum full of info.

Picked up a 1.4 mk5 polo 6n2 and looking at some rims and lowering possiblities.
Ive come across two sets of alloys which i like:
16 Keskin KT4s or
15s Rondell 0058s
On the Rondell 15s they come in one size for the polo 7x15 4x100 et35
Im swaying more to the 16 keskin kt4s as they have the more deep dished euro look, the 0058 only have a 2inch deep dish because of its et35.
The keskin comes in 7.5 or 9. Guessing 9 would be too wide? Also in a et30 or et25. Would et25 give me a bigger deep dish?
Also lowering it, if i go for the 16s how low would i go with the et25? would it be better off for the cheaper option to go for springs and suspension, or pay the 295 for the evo coilovers?
Guessing will be able to get around 80mm with the 15s with a 195/45 ?
Cheers
Adam