Unless you want to work hard at controlling their numbers for years to come, I'd say don't add them to the pond.

There's lots of information here on Crappies in small ponds, and very few have large crappie in them. It's the exception rather than the norm.

www.hoosierpondpros.com

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http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).