Help: Debating Upgrade - Dell T2400 & Toshiba T5200

Hello everyone
I got an E1505 with following specs:
T2400 - 1.8Ghz Duo Core - (2MB L2, 667 MHz, 32-bit processor )
1GB of DDR2 RAM
ATI X1400 card,
UltraSharp 15.4WSXGA+ (1680x1050)
60GB 7200RPM
9 cell battery
Original purchase price was $800 (refurbished with full 1yr warranty)

In a moment of weakness and temptation, couldn't resist & bought new Toshiba A135-S4467 with the following specs:
T5200 - 1.6GHz Core 2 Duo (2MB L2, 533MHz FSB with 64-bit)
1GB of DDR2 RAM
GMA 950 card (up to 256MB RAM Shared)
WVGA 1280x800 screen
160GB 5400 SATA Drive
6 cell battery

Dell warranty is expiring in May and so far it has been good! System has been reformated, and currently running XP Home. I can't afford to have two laptops, therefore I need to choose which one to keep. Granted, I got a great deal on Toshiba (under $700 if rebate goes through), what would you do? Would you resell Toshiba for profit and invest in the extra warranty, or say bye-bye Dell and get started with Toshiba with Vista Premium and full 1 year of warranty? I realize that Dell is better specs (video, LCD, battery), but considering the Duo Core vs Core 2 Duo and the excellent Toshiba price, would you compromise?
I occasionally do video and photo editing, that's when I believe I really benefit from ATI card. It's nice to have a 3+ hour battery, but I don't really need it, since it is used mainly at home. I guess I would love to have a bigger HD, and faster processor, but not sure if the trade-off is worth it!
Please help with any advise! Thanks much!