I have no idea what the difference between is between a T version or M version of the game however, as far as Oblivion as a whole goes, the GOTY is the best one to get it comes wit the 2 major DLC already included.
If you get the regular version then the DLC available are:
Shivering Isles: adds a new island full of crazy strange people lots to explore, new weapons and armour, a full quest with smaller quests from different NPCs, hours of gameplay.
Knigt of the Nine: You go on a holy pilgrimage to reclaim all the pieces of a knights armor on order to free him and the other 9 knights from a curse of sorts. It takes a while and is a good addition but not as deep as Shivering Isles.
Mehrunes Razor: A new mining camp/ruins are added to the game and you go on a quest to recover a sword
Wizard's Tower: Basically a really nice Tower in the Jerall Mountains for you to live in, good for mages, offers a nice selection of ingredients in your very own garden for your potions. Also lets you enchant items even if you don't complete the mages guild quests.
Battlehorn Castle: basically a castle to live in. you also can recruit 1 knight at a time to go with you on your adventures, will give you your own forge for repairing weapons and a mini quest to destroy a Liche.
Thieve's Den: adds a cave where you'll fight some skeletons and after defeating them its another place for you to live and you also can recruit your own pirates who will go plunder when you send them out and leave you a cut of the money in a chest in your room.
The Orrery: very short quest to recover some stolen pieces to fix the mages guild observatory
Vile Lair: another place to live particularly good for vmpire characters or evil characters. Comes with your very own minion who will murder a random person if you command him and he leaves loot for you in a chest. Also includes a pool that cures Vampirism and an eternally sleeping NPC for your vampire feeding pleasure.
Spell Tomes: a nice one for mages. adds about 200 more spell books to find with unique spells.
and finally
Horse armor: honestly its a waste of money. It sthe only DLC I would not recommend, its pretty self explanatory. your horse will have armor.
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