Hmmm, tough decision! If it were me, and I really liked my gear, then I'd keep it. It can be difficult finding a set of speakers that you really enjoy, and once you have, I say stick with it - until you grow tired of them. Also, taking a $900 loss after eight months would be too much for me...if I liked the gear.
Now, if you've got the itch to upgrade, then maybe it's not such a bad move to sell it. You could look at it this way - you got to use the equipment for eight months for a rental fee of $112.50/month. Not too shabby for nice equipment, and now you have an easy way to sell it and upgrade to something else.
Ahhh, I'm now starting to understand your dilemma. Bottom line from me - if you like the stuff, keep it.