I have not encountered any problems with Safari on financial sites since 1.2.1 (included in the OS X 10.3.3 update) other than the occasional Microsoft Windows only site that won't work with anything except Internet Explorer 6 running on Windows and those won't even work with Explorer 5.2 on either the Mac or PC.
But if you like a Mozilla variant, I have to say that at the moment Firefox has surpassed Camino and it seems as if Camino development has really slowed down.
iMac 3.06 GHz core 2 Duo OS X 10.5.8
MacBook Air OS X 10.5.8
MacMini core 2 duo OS X 10.5.8