If an aftermarket wheel is heavier than your stock set up it will cause more wear than a stock wheel. In most cases they are lighter, but even if the are not, I wouldn't consider the additional wear to be "excessive".
There are several companies that make that style of wheel, but most of them are true 3 piece and are rather expensive. The only one I know of that should be reasonable priced is soon to be released by Eagle Alloy wheel. Its the Eagle 227 pictured below.
Something to factor in when making your decision on wheel size is the cost of tires. Research the size you want and compare costs for 18's or 20's. You may find that going with a bit larger rim will save money or tires.
