I looked at selling some cards to StarCity about a year ago, they offered me 900 for my Mox. I never went through with it, because handing over a few grand in cards via mail just doesn't sit quite right. I'm not sure what kind/if any protections there are for the seller in these cases. That Mox is pretty much irreplaceable, so if they "lost" it or whatever, I'm out a huge chunk -- then again, that Mox just sits here doing nothing.
Without haste the creature Kaalia put into play on the first combat could not attack on the additional combat step.
Things that large, you're generally better off doing in person at an event. That way if there's a question about condition (and for power, there will be), you don't have to deal with return shipping if the updated quote isn't to your liking. If 900 was their NM price, I can pretty much guarantee they would have adjusted that down once they saw the card in person. Unless you cracked it out of a graded plastic case or something, they'll find a reason to call it LP. It's one of the reasons that I *buy* from SCG. Their grading is so strict that I can always know a LP card is going to be nearly flawless.
For the European market,Magic Card Marketis a good place to check.
