WTB: I want to buy a good mountain bike. Giant Talon, Specialized et…. - $750 (Horseheads)

ISO: WTB: I’m looking to buy a mountain bike or cross country / road type bike.
I think I need a large frame but might be able to use an XL.
And not sure but I might be able to use a medium too.
Preferably a 29” but a 27 may do.
I’d like a Giant talon, fathom, or decent Trek, Specialized etc.
I’m new to bikes but I think something along those good quality lines / brands and probably a hardtail is the way to go.
I want something that’s like new or doesn’t have a lot of wear please and I’m willing to pay more for the right bike.
Lmk what you have.
Thank you.
Tags.
XC Bicycle MountianBike Specialized chisel Trek Xcaliber Giant XTC SLR