Very good, but I would love to read of Clow Reed's parents, his child hood, and his defiance of the mage's associations and his opinion of the grail. Probably he would think it to be nothing more than a excuse for magicians to senselessly kill each other.

05) Fairy Tail (Shirou gets sent to this world by Zelretch)

06) Familiar of Zero (Shirou gets sent to this world by Zelretch)

17) Magical Girl Lyrical Nanoha (Shirou goes to Uminari city to investigate some rumors)

22) Persona Series (Shirou goes to Inaba to investigate some rumors)

27) Tsubasa Chronicle (Shirou meets Syaoron and the gang when they're in his world, looking for one of Sakura's feathers.)

With Card Master, those are probably the best.

02) Charmed

12) Hellsing

16) M0

19) Merlin

24) Supernatural

27) X - Men: Evolution

Any of these at any point in the timeline

...your ideas are really good... I have to admit...
the part where it seems like it's only a prologue is annoying though... not that it lowers its quality

Better than the last one, but it's not really Shirou unless he loses his memories in the fire, is it?

awesome idea though it's possible that Zel know that Shirou is the successor of the 1st and 4th magic even it's only half of what it's supposed to do anyway you should write his soon if possible