Jones was 29 years old last season, and his OBP and especially SLG has gone down each of the last three seasons.
Year: OBP SLG Age
2002: .341 .541 27
2003: .333 .464 28
2004: .315 .427 29
Having watched Jones for several years now (local Twins fan), he's got a horrible eye. He chases anything up in the zone. I doubt at age 30, with declining numbers like that, he'll all of a sudden break out for 30 homeruns. I don't know how much a given player is worth in your league, but the numbers you threw out seem to be more what I would expect, so if that justifies a $26 investment, I guess go for it.
Up until the heartbreaking injury suffered by Jason Kubel in the Arizona Fall League a couple days ago, I was pretty sure Jones wouldn't be with the Twins next season. Now, I'm not so sure, but I'm pretty sure Michael Restovich could replace Jones' production (decent power with a horrible OBP) for league minimum instead of Jacque's $4+ million salary.
Justin Morneau will be the first Twin since 1987 to hit 30 homeruns in a season in 2005, not Jones. He hit 19 in 280 AB last season. I don't know if it will be next season, but I'd bet good money Morneau becomes the first Twin to hit 40 since the Killer.
Heck, I like Jones' career 162 game average for a guess at 2005, which in 5x5 categories would be:
81 R, 21 HR, 78 RBI, 10 SB, .284 AVG