Pannier systems are rare as hens teeth for curvies now, unless you buy these ones quick.
http://forums.sv650.org/showthread.php?t=223092
Otherwise soft panniers & a top box on a rack. Some bolt a top box to an old rear seat.
As for a softer seat, get someone like Tony Archer to put a gel pad in your standard seat. £60 to do it i hear
http://www.tonyarcher.co.uk/