I just added the 701, amps and speakers to my W200. Of course, it was a HUGE step up in sound, but that's the amps and speakers, too.
The UI for controlling the 701 from the W200 is very easy to use. But, it seems to be just a little flaky. Sometimes, certain settings seem to get lost when I tweak them and then hit one of my preset buttons to go back to a saved config. Plus, the memory presets don't save any of the settings that are part of the W200's built-in audio control (i.e. fade, balance and sub level).
Also, jluv, you should know you can use the Graphic EQ OR the Parametric EQ, but not both. It's either/or.
If you're going to run an active config, I'd definitely recommend adding the 701 to the W200. If you're going to stick with one amp driving a passive crossover to your components, then I'm not sure I'd bother, 'cause then you can't really take advantage of the time alignment feature - unless you mounted your component tweeters right next to your component woofers.
Bottom line: if your setup is already tuned and giving you a flat response curve, then there's not a lot of point in adding the 701. OTOH, if there's some adjustments you want to make (like time alignment) that you can't make with your current setup, then the 701 is a great way to get there.