The play I would make on the SLR would be to not sell the GT, but buy the SLR for the sole purpose of selling it. If you can buy one for $250,000 or less, and cash is an issue, you could finance the entire amount, and likely come out whole. After a few blasts down the road and valeting it in front of the best restaurants/clubs in your city, most GT owners would be ready to part with the LSR. You may even be able to trade it favorably at a MB dealer for an SL65, SL600 or SL55 which could provide a continuing "free" blast of fun. From the standpoint of performance, the SLR is really not much better than a SL65 which sells for $180,000+ and the SL65 is not much faster than a SL600 for $130,000+. Great 2 year old, low mile examples with 1-2 years of warranty remaining can be found for $50,000 less than original msrp.