you are probably not going to find one mod that changes so many things, but you could if you use mutiple mods.
i for one currently have about 50 mods that i have made compatiable activate in my KotOR game, as well as about 20 more i have chosen to not currently use at this time. i also have some of my own personal mods running also (as well as working on a very interesting update with a twist to my recruit Yoda mod)
i have the All In One Force Powers (
http://pcgamemods.com/mod/7313.html) , Reign of the Sith (
http://pcgamemods.com/mod/6863.html) , Ord Mandell (
http://www.citlink.net/~redhawke/mods.html) , Segan Wyndh sabers (
http://www.jumpstationz.com/) , Clear Core Sabers (
http://www.lucasforums.com/showthread.php?t=149176) , Jedi Canderous (
http://www.citlink.net/~redhawke/mods.html) , Jedi Mission (
http://www.citlink.net/~redhawke/mods.html) , Recruit Mekel (
http://pcgamemods.com/mod/10084.html) , Black & Red Droids (
http://pcgamemods.com/mod/11288.html) , Ebon Hawk Basement (
http://www.hosey.org/kotor/basement/) , Tomb of Exar Kun (
http://pcgamemods.com/mod/6261.html) , Chain Lightning (
http://pcgamemods.com/mod/9598.html) , Kill Yuka Laka (
http://www.geocities.com/d333mods/) , Prestige Robes (
http://pcgamemods.com/mod/5620.html) , Darth Nemisis saber (
http://pcgamemods.com/mod/9607.html) , Arena Mod , Shaggoth's Sith reskin (
http://pcgamemods.com/mod/9399.html) , Mech Malak (
http://www.angelfire.com/crazy2/xclone_0101/kotor_mods.htm) , Waraxes Single (
http://www.jumpstationz.com/) , Waraxes Dual (
http://pcgamemods.com/mod/6638.html) , Jolee Clothes (
http://www.citlink.net/~redhawke/mods.html) , Invisible Headgear (
http://pcgamemods.com/mod/12288.html) , Sith Items Imporved (
http://www.citlink.net/~redhawke/mods.html) , Bastila Revalation Robes (
http://www.jumpstationz.com/) , Kamino Eugenics Chamber (
http://www.citlink.net/~redhawke/mods.html) , Juhani Dark Robes (
http://www.jumpstationz.com/) , Lightsaber 6 pack (
http://members.shaw.ca/t7nowhere/KotOR.htm) , Revan's Mask Plus (
http://members.shaw.ca/t7nowhere/KotOR.htm) , 8 New Saber Colors (
http://www.btstudios.us/mods/colorcrys.html) , svosh all in one (
http://www.angelfire.com/crazy2/xclone_0101/kotor_mods.htm) , just to name a few.
Padawan Mod (
http://pcgamemods.com/mod/7808.html) is a mod that will let you start as a Jedi, and even alter the story on the Endar Spire to explain it better.
though i have yet to use this mod, it could perhaps provide a different game play experience, Xia Terashai Set (
http://www.jumpstationz.com/).
i also use this Balance mod (
http://pcgamemods.com/mod/13143.html) but i made my own personal variations to it. variations to this mod are as easy as just picking and choosing which .2da files to use and which to not but all offer some changes for the game.
if Tweaksta ever releases this mod (
http://www.lucasforums.com/showthread.php?t=149860&page=1&pp=30), it could potential change the whole look and feel of KotOR.
hopefully some of this post, which took more of my time than i expected :p, helps!
(on a side note: Moderators, do i win a prize for the most hyperlinks in a single post?? :p)