+1 for getting the Toshiba Satellite Laptop
and as for swapping out the motherboard .. that would be alot of investment & effort to get it done, compared to buying that laptop.
- new motherboard
- new CPU
- new RAM
- new PSU (OEM 2400 has only 20pin)
- new HDD (2400 has only IDE)
- possible new case, backplate most likely not work with new motherboard.