I really loved those ASM clips--really cool.

Ultimate Spider-Man...I liken it to Batman: Brave & The Bold--not exactly my preferred take on it, but it still works and keeps to the core of the character. Some of the bits actually were pretty funny.
With the Nova book and the price--if I remember right, if you buy the Avengers Vs. X-Men book, you get it for free, but you can get it individually for 99 cents. I don't know if it's going to continue post-AVX.
Another thing you don't mention is that as a digital comic it's done completely different from what they've been doing in the past. Instead of just having the comic page, it works with the tablet/computer screen, and dialogue balloons and text appears in different ways. If you want a good example of it, Mark Waid actually did a proof-of-concept digital comic called
Luther (right click and save as to get the best effect), and you can see some "pages" of the actual Nova story
here. You can also read this
explanation of the concept in digital comic form by one of the guys helping Waid with his digital projects.
I don't get what you guys mean by the "real Nova." Hasn't there already been several Novas?