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
Thanks for your responses. They are quite helpful.
Ken - I had not considered the LS-5 before, as I was unfamiliar with it. In researching it, I see it accepts only balanced inputs. My sources are a PH3-SE and an Arcam FMJ CD-23T cdp, both of which have only single-ended outputs. Doesn't this rule out the LS-5 ?
No not at all. Pick up the Cardas rca-xlr adapters readily available. They are a high quality adapter that wont degrade the signal in the laest IMO and will allow use of the 5. You may need a pair for your output to your amp also.(XLR-RCA config) They ususally go for about $50 pair..it's still cheaper than changing all your cables or components. Well worth the cost to be able to use the LS5. Alot of folks are intimidated by the all balanced in/out of the LS5 or figure its not worth changing their whole set up. IMO this pre amp IS definately woth building around it, The Cardas adapters will allow you to have your cake. :) Ken
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