Base Set: 107 of 198 (54.04%)
8 Sheer Dominance Silver (42 cards, 1:3) G. Maddux, The Big Rat, L. Walker, R. Alomar, R. Clemens, M. Vaughn, J. Thome, J. Bagwell
2 Sheer Dominance Gold (numbered to 2000) Chipper, D. Jeter
1 Chirography: R. Clemens /400
According to Beckett, Roger Clemens signed only 400 copies of his '98 SPA Chirography cards -- although the card itself is not serial-numbered. They lists it at $60-$120. Even if this card fetches the more realistic LO end on eBay, this card all but pays for the box.
Compare that to the three junk autographs I got last year, and a winner is 1998 SPA.
For comparison's sake, here's my break of last year's SPA.