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I wouldn't rule it out. I definitely would like to get back there. I didn't find it at all dirty. (I hope it hasn't changed so much in 1 year!! Maybe it has???).
Oh that's so good to know. My first trip over I spent 3 months there and I loved it. I loved the people and, well, everything about it. I had a nice little bungalow at the end of white sand beach and it was a little slice of heaven for me. And Lonely Goose, who's mate died and he started hanging out with the ducks. And my dogs. Sorry, reminiscing......
If what Paul says is true, I wouldn't rule out Koh Chang.
Lanta is a nice choice too tho and if you want to explore you will have more to see and do in the Krabi area, or just peace and quiet if that's what you're looking for. It makes for a wonderful mix of both. Sure it's a little farther, but a day's travel is not much and totally worth it. There is all kinds of accommodation there as well from rather cheap to very expensive.
OR, Koh Jum and Koh Kradan.
Koh Jum is a really nice island still using oil lamps and candles as they have no electricity and it seems that's just the way they like it. It's a really chilled place, and quiet too. Some people would never go, others would welcome the idea. You can hop a boat from Krabi to there.
Koh Kradan is gorgeous and quiet. It's part of Hat Chao Mai National Park. It's definitely worth a look. You can also get there easily from Krabi.