The best summons

[KnotKnormal]

What are the best summons for each level of the Summon Monster spell. I know different monsters serve different purposes but i was hoping to put together a quick list of the best.

Thanks guys.

[Vaz]

Unicorns are awesome for SNA, best possible healing for their level.

[khadgar567]

What are the best summons for each level of the Summon Monster spell. I know different monsters serve different purposes but i was hoping to put together a quick list of the best.

Thanks guys.
thanks for opening the treat is any one know fire nymph's (cr 4) summon monster spell

[turbo164]

Here's a pretty good list (which includes a few more links):

http://www.giantitp.com/forums/showthread.php?255219-The-Summoner-s-Desk-Reference-D-amp-D-3-5

The SLA sections are particularly useful for when you need something situational like Soften Earth and Mud or Detect Poison :)