Yipes is like $3000 for 10Mbps and Telseon I am not sure about. Yipes has far better peering than Cogent and from what I heard it's awesome but the prices are not even close to Cogent. Good to BGP them both though but you need 1000 IPs in order to apply for BGP and most carriers won't give you that many IPs unless you can prove usage.
http://webhostingtalk.com/showthread...ighlight=yipes
http://webhostingtalk.com/showthread...hlight=telseon