Obviously West is a PF, and Pek is a C, but I still think this gives us an idea of what the market for bigs looks like. Last season, West averaged 17 and 8, with 3 assists. Pek averaged 16 and 9, with 1 assist. Pek's TS% of .572 was higher than West's .545, while West's WS/48 was slightly higher than Pek's: 0.179 to 0.163.
David West is also 5 years older than Pek, which should add to Pek's relative value. However, West has been healthier than Pek, playing in 30 more games over the last two seasons (plus playoff games).
In general, Pek is a somewhat better offensive player than West, but West has the advantage on defense. I think having a competent 7-footer is still more coveted than a PF, despite the small ball craze. I predict Pek gets slightly more $ than West: $13 million per season. Admittedly my contract knowledge is limited, so I would love to hear your opinions.