I'd have to say Registration Fee to mid $xxx. I think its really too early to tell how well accepted the .me TLD has become since it has entered the domain market. I like the domain name. I wonder what someone would develop the domain into? I'd say currently its market value should be around $300. However, I'll use Registration Fee to mid $xxx to take into account the fluctuations in the new .me market.
Wow, everyone seems to be throwing a wide net over the valuation here! Obviously "impress.me" is a fantastic domain that's likely into six figures. Impressive.me though? It just doesn't quite gel with me, I'd put it at high $xx undeveloped and wish you the best of luck with your auction