I must respectfully disagree somewhat with the Psychic (but then, you already knew I would ;-)
If you must build the entire HT system for under $2k you really can't afford a lot for wires, cables, interconnects, etc. And the cabling can be very component-dependant, so I'd have the "boxes" I love first, then optimize the cabling for each of them. Put more into the basic component quality, and by all means consider buying used to stretch your funds. Electronics depreciate rapidly - you could buy a former top-flight receiver for a third of what it sold for a few years ago - and speakers are routinely available at 50-70% of list.
If you must build the entire HT system for under $2k you really can't afford a lot for wires, cables, interconnects, etc. And the cabling can be very component-dependant, so I'd have the "boxes" I love first, then optimize the cabling for each of them. Put more into the basic component quality, and by all means consider buying used to stretch your funds. Electronics depreciate rapidly - you could buy a former top-flight receiver for a third of what it sold for a few years ago - and speakers are routinely available at 50-70% of list.