Does anyone know someone who already modified or can modify Umbraco? I want it under my own brand and don't let it looks as Umbraco but otherwise.

No:

"To the extent the Software contains the Umbraco name, trademark, brand and/or the Umbraco logo, any copy, modification, merger, publication, distribution or equivalent use of the Software shall retain any such names, trademarks, brand and/or logos intact."

http://umbraco.org/license

"I want to resell umbraco under a different name or sell it as apart of a bundle.

Then you would need atleast umbraco Pro without any support attached to it, as you cannot rebrand the open source version."

http://umbraco.org/tour/for-professionals/umbraco-pro/what-version-is-best-for-me