LS V-8's are nice, but with a few boxes checked I believe they sticker north of 50k, don't know about rebates but yikes!
I'd give the s80 the nod, it's certainly the most practical and reasonable of the cars listed. The question is 2.5T with AWD or T6 with FWD. The t6 makes more power but you have to fight it a little more with all that torque going to the front wheels.
I guess the interior to the S60 isn't her bag? Too bad because its only a tad bit smaller and definitely more performance oriented.
The Jag is a nice car, but I think a little overpriced (even with the price drop) and doesn't have the best reliability record.