Fine Scale Miniatures - FSM are the Gold Standard Kits - also check out the amazing Franklin and South Manchester Layout FOS Scale Limited - High-quality kits with a lot of character LaserKit - They have Southern Pacific Standard Depot kits (as well as a lot of other cool kits) - I've built all of the SP depots.
Java Model Railroad Interface (JMRI) -
Still poking numbers into CVs to program your decoders? Then you need
JMRI's DecoderPro and you will wonder how you ever got along without it
:-) Tony's Trains - A great source of chips and parts for DCC as well as discount locomotives. OpenDCC - Want to build your own DCC decoders? Look here.