Taking Spell Specialization multiple times.

[Natural 1s]

Is taking Spell Specialization feat multiple times good idea for wizard specializing on Summon Monster spells?

I have already taken Greater Spell Specialization feat, so I can replace chosen spell every even level.
If I take Spell Specialization feat multiple times, I will replace the lowest level Summon Monster spell with the highest level.

Other summoning feats I have taken so far:

Acadamae Graduate
Spell Focus (conjuration)
Augment Summoning
Superior Summoning
Spell Specialization (Summon Monster V)
Greater Spell Specialization