What is the difference between それならいい and それならいいんですが?
I'm guessing that the んですが implies some sort of unsaid reservation or concern.
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んです is a colloquial saying of のです. A dictionary says のです indicates predication which emphasizes a reason.
I think this が is used when you hover on saying something definitely. For example, こっちの方が良いと思うが, あなたは悪くないと思うが. http://dictionary.goo.ne.jp/jn/34931/meaning/m0u/%E3%81%8C/
So それならいいんですが indicate you hover on saying それならいいんです definitely.