Go for the most expensive one, then do the others after. I think the CCNA is probably one of the cheaper ones. My CCNA only cost around 80 CDN because Cisco gave me a 50% voucher for passing the Network Academy. Do whichever of the three you enjoy to do more.

I'd pick CCNA, but thats just me! MCP's seem to be a dime a dozen. Unfortunately CCNA's seem to be heading that way also.