FTP on the Go (Regular; $6.99 - "Pro" version apparently has some iPad optimizations and is $9.99) :
For what little I've done, it's been good 🙂 You can edit stuff in app, and import from the camera roll (and video if you've that function). You can also browse the net from with the app, lets you preview and also get stuff elsewhere to your FTP since this app doesn't peek through other app's files.
Also, HTML Editor($4.99) has a built in FTP client/ but won't, IIRC, save passwords.