Thinking of adding a few Lady Gouldians...any opinions?

[wildgardenia]

We currently have 2 cockatiels and a sun conure. I really like watching the finches flit around their cages. I'm thinking of the Lady Gouldians but would like a finch breed that is very quiet. Are the gouldians a quiet bird for the most part? I don't think my female cockatiels are noisy at all and if they are similar in vocalizations that would be just fine. I'm thinking of starting with 2 finches and moving up to possibly 4 or 6 since my cage is very large.

I was also looking at the Splendid Grass Parakeet otherwise known as the scarlet/red chested parakeet as well. I've heard they are very quiet but rather boring to watch.

Any thoughts are appreciated!