catonec 

short of the cover wearing out your ponza should last a gooooood long time, much more than 3 years. It sounds as if trying some adjustments should be your first option considering the multitiude of different saddle designs/choices available. people can spend months and a crapload of cash searching for the perfect saddle. another option to consider is your bike shorts/chamois. assuming you wear padded shorts, some chamois can lose shape and function over time and washings.
Im sure you can probably get your ponza re-covered, perhaps an upholsterer, or cobler.
if you do decide to replaced your saddle, your lbs may have the specialized butt measuring device or a saddle swap program. that may save you some cash.
your manhood may demand an alternatively shaped noseless saddle.
Im not going to even mention the last option...yikes!