Well, I went through the list and decided what I wanted, finally. I figured I'd probably later shoot myself if I didn't get the Zapamajig, so I used the majority of my points for that. I went ahead and purchased one of the blasters via the auctions. And then I went through the list of items to see what else I wanted. Using Phlameseeker's awesome chart, I then figured out which ones I could get with my plot points that would save me the most in neopoints...and bought them. Then I went through and purchased all of the others I couldn't get with my plot points.
At that point, I realized there were only 6 prizes left that I hadn't gotten somehow...so I went ahead and got them too. First time I've randomly splurged in a while. Between the blaster and all the ones I couldn't get with my plot points, it set me back about 1 mil. {winces}
But now I get all smiley-geeky like when I look the last pages of my SDB.
...I so wish I'd done this with previous plot prizes. Then I could have a plot-prize gallery. But at this point, it'd cost a fortune to do, as I'm missing some of the key things (like the ROTL). Ah well.
Edit:
Oooh! Solutions page!
http://www.neopets.com/space/ros/solution.phtml
However, the following solution (the one we initially developed) was about three seconds faster:
<giggles>
Wow, having skimmed it, they really outdid themselves with the explanations.
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*hugs for Chris* 
There's no actual existing avatar associated with having a robot pet, to my knowledge. 
