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In my first play through, as a Sentinel, I managed to save them all. My sister however, lost Tali.

She had Tali's loyalty but she never woke up Legion, so sent Tali through the vents.

My play though:

Vents: Legion(Makes more sense as he is a synthetic, can hack anything)
Leader 1 and 2: Garrus (Miranda wanted it to much in my opinion)
Escort: Zaleed (The dude knows how to fight)
Biotic: Samara (Jack is said to be the strongest human biotic, but to me Samara is still stronger)

For the most part I had Mordin and Tali on my team. Mordin's Incinerate was very useful in conjuncture with a sentinel's abilities and I just really like Tali.