My current setup is mic->shure pad->pacifica->a-designs atty->rme adi-8ds
I really wouldn't suggest spending that kind of money on preamps & converters for a budget setup. Like I've mentioned above, your monitoring is way much more important than preams & converters, as long as you can attenuate the input to a reasonable level to go into your interface, which the -25db should do. If not, chain another one.
As for the DAW, it's all the same shit. If you wanna spend the crazy money for a Nuendo 4, it's a good soft, gives a shitload of possibilities for routing, which you most likely won't use as of now or anytime soon, but at some point. I haven't seen the new cubase, but it should give you all these features without video for a lot less $$$.