Upgrade or sell ARC LS-15 ?


I have an ARC LS-15 preamp. I am considering the GNS reference upgrade for $1500. On the other hand, I could sell it for $1300 and purchase a used LS-25 for about $2800. What would you do ?
mbonn
Ken, Thanks again for another quick reply. I am using an ARC VT-100 Mk II pwr amp, so I can use the XLR inputs on that. I think I will pursue the LS-5 route. Thanks, Matt