Hi Guys

I am new to these forums. i recently got myself a 2011 1.4 VVW Polo Comfortline. I am from South Africa. i am stuck between a 15'', 16'' and 17'' rim and cannot decide which one will be the best in terms of fuel consumption, loss of power and wear and tear on the car. the car originally have the 15" Riverside alloy wheels with 185/60 R 15 tyres.
specs Polo Range. < Polo < Models < Volkswagen South Africa
i was thinking of putting on the Budapest 7½J x 17" alloy 215/40 R 17 Cross Polo Rims. how will these rims affect the above mentioned concerns.

which lowering kit/coilovers will be best for my car. we have a distributor for eibach lowering kits. what is the difference between the lowering kit and the coilovers and which is better and cheaper. which of the 2 will not compromise the ride quality.

i would appreciate your guys input.