The Grado RS1i demo from Audio Advisor for $417:
http://www.audioadvisor.com/prodinfo.asp?number=1GRRS1I&utm_source=MailChimp&utm_medium=email&utm_content=Grado%20-%20RS1i%20-%20Reference%20Series%20Headphones&utm_campaign=Audio%20Advisor%20Clearance%20Newsletter&uid=d5e6ea25c3
HE-400 demo for $263:
http://www.audioadvisor.com/prodinfo.asp?number=1HMHE400&utm_source=MailChimp&utm_medium=email&utm_content=HiFiMan%20-%20HE-400%20Headphones&utm_campaign=Audio%20Advisor%20Clearance%20Newsletter&uid=0c9ba4960a
http://www.audioadvisor.com/prodinfo.asp?number=1GRRS1I&utm_source=MailChimp&utm_medium=email&utm_content=Grado%20-%20RS1i%20-%20Reference%20Series%20Headphones&utm_campaign=Audio%20Advisor%20Clearance%20Newsletter&uid=d5e6ea25c3
HE-400 demo for $263:
http://www.audioadvisor.com/prodinfo.asp?number=1HMHE400&utm_source=MailChimp&utm_medium=email&utm_content=HiFiMan%20-%20HE-400%20Headphones&utm_campaign=Audio%20Advisor%20Clearance%20Newsletter&uid=0c9ba4960a