I think the first thing you should consider is the type of pitchers you'll need based on the park you're gonna play in because even though you can find lots of great, low ERC# pitchers, if you place them in a park that's not condusive to their strengths and which exposes their weakness, you may find yourself quite disappointed with an expensive pitcher. Me personally, if I'm gonna play in a hitter's park, e.g., Kauffman Stadium, with a few exceptions, I generally go for low OAV#s (less than .200) and low ERC#s (less than 2.00) over BB/9 and WHIP, because IMO a walk will hurt you less than a hit, especially with runners on base, and because I personally think a pitcher's ERC# and his history is more indicative of the production you'll likely get from him. Of course I don't know this as FACT, but that's the way I look at when drafting a pitching staff.