Style 300 for a great deal - debating

[Foxx]

I've been shopping around for for some 21's for couple weeks and would like to put them on still before winter, then switch back to 19".
I have a really good deal on OEM style 300 rims with tires: $1,200
They were on my list, but not #1, also they are 20" and I wanted 21".
So I'm debating if I should get them as they are only 3 weeks old, perfect condition, only $1200. Or should I wait and for sure pay more for 21", I might even have to go with replicas.
The 300 do look good on 2009, 4.8 - Black Saphire, with running boards and aero kit, that's what I have.
Any advices?
Thanks all!!