Got yah...
I have looked and looked for a supplier good low-esr caps, I have given up. There are those ebay ones, which are 35v/1500uF for $19 for 25 caps (good deal), and the one 25v/2700uF Novak cap, which is enough voltage rating for up to 4s LiPo; the Novak one sells for $10, which all you are paying for is the Novak sticker, maybe they ARE good caps, but thats not the cost...
Here are some good options:
Novak 25v/2700uF low-esr (unknown manufacturer)
http://www.shopatron.com/product/pro....56.7400.0.0.0
Nichicon 35v/1500uF low-esr (better choice IMO)
http://cgi.ebay.com/25-Nichicon-35V-...QQcmdZViewItem