Around 2100-2400 cfm. Don't mess with the small stuff. You'll be throwing your money away...so be preppared to pay a little more. I'd say around $175 bucks. Most local stores will be selling the 1800 cfm (or close to it) They can probably order you a bigger one or you can try some of the vendors or hot rod shops.
Locally, I saw a 2100 advertised for $150 so do your shopping before you lay down the green stuff.