Prompt 2 is a good one I've read
Comes from the people that develop Transmit for Mac and iOS
I use iSSH too and hadn't realised it had been removed from the App Store. Bollocks
Have a look at ServerAuditor, its free (IAP for some non essential features, and tabs) but has an awful name. I downloaded it myself the other day to check out the state of ssh clients.
I agree that Prompt 2 looks nice, but I've been unsure about buying it to try. That said Transmit is nice.
I use vSSH with touch gestures and sync with osx version of vSSH.