Which side of the ocean are you on? If in the states, I like Gatsby - he's sired hunters, jumpers and his is approved (even though you said it wasn't a requirement). http://www.foxdalefarm.us/gatsby.htm
Balta'Czar - just look at all his progeny pics on his webpage, every single one has a great loin connection and a round, powerful engine. I specifically chose him for this reason - my mare needed a stronger loin connection and more substantial butt. Her foal is the last one, at the bottom ("Belmont"). http://www.jumpstartfarm.com/Default.asp?Page=114#Balta
This is something that we have had judges comment on several times at many different foal inspections so I know it's not just my opinion. Palladio does seem to improve the topline and loin connection on most of his foals.
Add Coconut Grove to the list. He did a very consistent job of putting a fabulous loin connection and super hind end on three foals out of three of my mares who couldn't be more different. From the wither back, there was no doubt that those three girls shared a sire.
He's TB by blood, but approved with multiple WB registries, such as GOV and KWPN, Holsteiner Verband, Hanoverian Verband, Selle-Francais, BWP, AHA, AHHA, RPSI... to name a few. So, it could be argued either way - if one wants to argue he's a just TB, one must accept that he's a lovely, athletic and warm blood-y type TB
But yes, he's really much more of a jumper sire.. But good god, do they jump! Probably not the sire she's looking for, however.