This year is not the last year mits is making the 73'. In fact, they are coming out with a 82 inch Lcos.... Talk about Freakin Huge.
This is the last year though, in which they will have non integrated 73 inch set. Meaning that next year all the the 73' will have internal hd tuners, alongside with netcomand 3.0 and firewire.
Its been heavily debated as to the usefullness of the internal tuners, but if you want the most options with the largest screen (and cannot control back lighting), the 73411 is the way to go.
I would agree with JimRochester though.. if it been a floor model, stay away...... regardless of what the guy throws in (warranty, floor mats, etc). If it has been an open box, thoroughly inspect......
Also regarding bigE's comment of the 65' with 9 inch guns..... its a beatiful set and well worth the wait.... It has an awesome picture and comes with a 1394 firewire and dvi and netcommand that has learning capability. (what else does one need? =)
Good luck Jason!