There are tons of cool 15" rims for your car as well as a wide selection of tires. A lot of the wheels are less than 10 lbs. and some less than 9 lbs. A 15 x 7 wheel with 4x100 bolt circle with about +40 or + 42 offset and a 56.1 mm center hole is common Honda Civic fare and will fit fine if the brake calipers clear. Try Enkei, BuddyClub, RacingHart, etc. The best performing 15" OEM wheel from MINI is also the cheapest. See other threads about unsprung weight and rotating mass.