I've voted for nr 4 but here's my thoughts on it.
Although I love creating skins etc. I'm not a graphics artist by any means. I have read up a bit on the topic of logo design though, so I'll share that with you.
A logo should work in grey scale (black & white) since people will probably make copies of documents that have your logo on them and you want the logo to still look good on the copies.
Keep it relatively simple and in line with your product/company.
Looking at your logo I think you have it done. The pattern that fills the text on logo 4 is a nice touch but if you remove it so that the logo is just black and white you are golden.
With the simplified version of logo 4 you can always make changes in colour and fill for artistic effect but the basic design will be instantly recogniseable.
Good job :doublethumb: