Jay's got a good point. Start with the seat lift mod and see if you like it better. I thought it was a great improvement for my daily commute.
How long are you riding at a time? I ride 30 minutes to work and maybe an hour or so each way on my weekend rides before I stop and do a little walking and stretching. I found a great deal on my Police Seat and figured it would be a fun project but it was not driven by gross dissatisfaction with the stock seat and lift mod.
There are a number of ways to improve seat comfort :
First, you can increase the amount of contact surface area, which reduces the pressure on any given part of your butt. The problem is that as you make the seat wider you extend out laterally over the frame and have to find outboard supports like the head of the shock absorbers to keep your wider seat from twisting. Gort documented his solution using outboard springs here:
http://www.richard-perry.com/HDSeat/HDPoliceSeatConversion.htmlSecondly, you can change the resiliency of the foam in the existing seat. Amateur upholsterers make the mistake of just jamming in more cheap foam, or carving up the materials in some new way, only to be disappointed when the whole thing breaks down. If you're reupholstering your seat, ask for an HR (high resiliency) foam, with an IFD (indentation force deflection) of 2.0-2.4.
Thirdly, you can use non-foam viscoelastic materials to redistribute the pressure over top the foam. For example, the AirHawk air pillow or gel pads do that. Note that more gel is not always better. Gels absorb some shock, and redistribute your weight but do not provide the same dynamics as foam.
Fourth, you can provide mechanical elastic supports like springs or air ride cylinders.
So you've got lots of options, but there are no cheap direct replacement seats out there that bolt right on. The low volume of Savage seats, (and the fact that most owners are DIY cheapskates like me,) means there is not much of a market for aftermarket solutions.