Check my recent thread. PM me the criteria of what you're looking for: I have 15 year vets, 15 year hardcore ironmen, 10 year vets/hardcore, 5 year, I have accounts that have a staff and shield equipped, accounts created first day of RS release, things like that. so send me a PM of exactly what all you're looking I'll get back to you.
I don't use Sythe too much but can have my friend Hahanerd vouch for me, he's an OMM on this website, and has helped me sell plenty of old accounts here.