clueless IS250 f-sport own

just jumping on for my first post here, so be kind to a newb... being the clueless car chap I am but loving my car, I have been trawling the internet for a set of wheels for my 2010 IS250 f-sport for a couple of months with little luck, and the above post from ColinBarber is the first true reference I've found for the wheels I already have. sadly one of my front wheels was bashed and now goes down to about 12 psi a day or two after inflating, which other than likely being dumb to drive on is eternally annoying. my questions are: what in peoples opinions are the best new wheels I can easily source if I wanted similar? budget is about £800 and anyone any idea if I can just find one of these 42611-WY050 mentioned above (whilst getting the other 3 good alloys refurbed), and if so where? thanks for reading, any advice on sorting new alloys / replacement alloy appreciated