Blogs Organizer is da shit, running 202 blogs on (I think ) 7 hosts !!! You are basically presented with one "control panel" from where you add posts to ALL your blogs, edit them, delete them, play with the templates, manage your link trades, add categories, manage your RSS feeders, you name it.
Why would you want to use RSS feeds though? I pay for my posts (write eome myself of course) and I firmly believe this is the way to do it, RSS fed blogs got me nowhere
then 200 designs??? use 20 simple basic templates if you must but 200? what for? what makes you money is TRAFFIC
hosting - again its your blogs and your money but I would spread the blogs on 10 ips (or more of course) if I were you, take a look at seohosting, great prices - 10 C calss ips for 67 bucks. Unless you plan on trading traffic or feeding the blogs from your own network your only option of building traffic is link trading, having the sites spread on different ips helps big time, trust me on this one
btw if you want me to set up the whole thing for you hit me up:
psdotcomus
AT
yahoo
DOT
com
I'll do it for a very reasonable price