I recently (today) received a CTO 2.4GHz MBP (upgrade was the 200GB 7200RPM drive) as a replacement for a previous laptop. Would it be worth my time and money to upgrade to a 2.5Ghz CTO model (selecting the 7200RPM drive)? I do a fair amount of CPU intensive work, but have a 2x2.8 mac pro with 16GB of ram to handle it, however would still like a capable portable so I don't feel like its from the stone age when compared to my desktop. I checked eBay and the like, and saw a ~$1800-1900 selling price for sealed box CTO 2.4GHz, making it about $300 (w/ student discount) for a jump up (assuming I can sell this one for $1800). Does the 2.5GHz model offer enough performance increase, not just in core speed, but with the L2 cache and the increased graphics ram to warrant the extra few hundred (not really a huge issue) and the week or two it takes to sell something on eBay?