Well optimal stats for each player vary a lot. I play well in marginal situations & small pots, so I run a lot more loosely than other players probably should. I also spew money in big pots, so I've recently started 3-betting light less, and calling in position more.
You have to tailor your game to your strengths and to exploit your opponents. There's no best playing style, and thus there are no "best" stats.
However, Hold'em Manager has a nifty series of articles called "Plugging Leaks", and in the first one of the series they tracked various stats and compared them to player's win rate. If you download the hold'em manager trial, you can read the whole thing. Here's an excerpt from the article:
The following shows average bb/100 for players using a datamined database of NL 6 Max from NL100 to NL1000 over the last 6 months Ė I took results from the 1790 players with at least 5K hands in the database. For each stat I have grouped results into 5 equal ranges and then taken the median bb/100. Often it is more meaningful to look at combinations of stats but this should give you a general guide.
Median bb/100 based on VPIP:
VPIP = BB/100
< 18.3 = 2.18
18.3 to 20.2 = 3.46
20.2 to 21.9 = 3.04
21.9 to 25.3 = 3.72
25.3 + = -2.76
Note, it looks as though from this that a player with a VPIP of 27 is definitely going to be a losing player but please note that it is the upper half of that 5th group that accounts for most of the losses. Basically, this shows that any reasonably standard VPIP is profitable, low VPIPís less so and the players with the high VPIPís are the ones that feed the poker economy. Also note that very few of the high VPIP players ever make it to 5000 hands so the amount lost by high VPIP players is even much more pronounced than this chart shows. In fact, if you filter for all players with a VPIP higher than 50 you will probably find that the combined bb/100 for all these players is around -40bb/100!