Welcome to MobileRead, majaka!
Sorry to hear of your misfortune.
The new 505 models are retailing for ~$300 (you can find them for a bit less in some cases), and the 500 models on e-bay have dropped to around $250, I think, never can really tell with e-bay, can you?
The content tools work just fine for the 505, but the hacks don't -- yet (they closed the access on it, reportedly as a side effect of what they had to do to make it a USB mass storage device).
The big advantage to the 505, other than the USB mass storage thing, is that it's a Vizplex screen so it's noticeably brighter than the old 500.
When you get your new one, or your old one back, remember there's a built in lanyard attachment point on it.
