So, I'm thinking about replacing my Aguilar 659 preamp with an Ashdown ABM RPM-1 preamp. I just found out though that the 659 I bought used for $450 is now worth $1250 new! Now I don't know if I should sell it. What do you think? Is is worth keeping a piece of gear just because it's worth a lot? I guess it comes down to whether I can AFFORD to keep it or not. The 659 is worth $500-$600 used to me and the Ashdown is $699 new. I know myself and will probably stick it in the closet and rarely if ever use it after I get the Ashdown. I'm just worried that I'll regret it later.