which 2 lense should i buy ? sigma 19/sigma 30 / sony 50

I have the Sigma 30, Sony 50, Sony 16, and the kit 18-55 on my Nex-5n

50mm Sharp, one of the best 50mm I've ever used.

Sigma 30mm A very good lens, dont use much, as the 18-55 is more usefull, and is stablized which makes this a great video camera.

Sony 16, with wide adapter, great combo.