You can pretty much do everything with only Aldiko (I prefer the Premium version for $2.99). You don't have to get any other apps on the tablet as long as you've got the books in Calibre and do the setup as described in my first post... I have several other reading apps on both my Vox and Galaxy Tab but never use them.
Once you've explored Aldiko a bit you'll find it has a lot of really good features to customize your reading experience too.
http://www.aldiko.com/features.html