I am looking for, English mods only, new guilds. Really well defined and structured new guilds

Integration The Stranded Light has two extremely well put together guilds, and three faction type guilds.

Blackwood Company

Windfall

Lost Spires

http://www.tesnexus.com/downloads/cat.php?id=25&page=1&orderby=endorsemants&order=DESC&tags=

A couple tidbits on those linked mods (first-pagers):

The latest version of Knights of the White Stallion has a lot of busted-up AI Packages, so I would recommend staying away from that unless you are good with either the CS or TES4Edit and can fix the problems.

Now, for recommendations...

http://www.tesnexus.com/downloads/file.php?id=31773 a small quest mod that aims to address the horrible ending to the Dark Brotherhood questline. There is also an in-progress mod called Dark Brotherhood Chronicles that will help out here, but it is still in development.

You could also give Fighters Guild Contracts and Origin of the Mages Guild a try, but those two don't play nice with other mods, need a TES4Edit cleaning REALLY badly, and you need to download a massive 1Gb package to actually get them (no link, Google them).

Oo-ooo, try out The Order of the Nibenay, lets you construct your own guild with personal goals and your own guild base, very neat indeed.

Servant of the Dawn is another nice faction mod!