Spud Logo Options

I'm really stuck with this logo, I think I've been looking at it for far too long! What are people's thoughts on the different options? Spud is a micro CMS which is launching soon(ish). I'm looking for a clean and playful logo, possibly a couple of options with and without the logotype..

Do you think I'm getting this right? I'm having doubts... If the ideal solution is "start again", that's OK too. Thanks :)