I know v8 Lexus tend not to last as long but I really want a GS F. What about buying a 3 or so year old one as more of a toy rather then a daily driver? I figure it's still better then buying a Mercedes or BMW
That's a plan. You're on the right track-- you'd still be better off in Lexus than MB or BMW. Take super good care of it. Include 2 Scotty DIY videos in your daily diet. Scotty recently said that the "mark" for V-8 Lexus when they start hammering the wallet is about 100,000-mi. As a weekend toy, it'd take you forever to rack up that kind of mileage on the clock. If you truly can't do the V-6, babying a V-8 as a weekend toy is the way to go. Take super good care of it and take it to 350,000+.
I'd buy it as a weekend car over a daily driver.