Its impossible to know what company will still be around in two years, let alone ten.
Educate yourself, find your comfort zone (tubes/solid state, box/dipole speaker, budget, WAF, musical tastes, audio priorities, type of source/sources to be used, etc.).
Audition, attend audiofests, join local audio clubs, read enough reviews to find reviewers you agree with and to be able to read between the lines. Unfortunately this is all a hassle, takes time, and audio shops are getting more and more scarce in many areas.
Start with the lower product in a given price range that the vendor offers (better value to let someone pay for the R&D on the top of the line stuff).
Some say garbage in/garbage out, so prioritize on the source, but like Tyson I say speakers make the biggest difference in sound quality, WAF/available room/musical tastes/audio priorities/amplifier selection factors.
As a high value/fresh start buying tip consider powered speakers (compact, no pre-amp or power amp to shop for, what the studio professionals use). Examples: Audioengine A2+ (soon to be released, $250/pair, includes DAC, tiny); NuForce S3-BT (here at AC, $300/pair, more bass but still small, allows for RCA or quality bluetooth connections); AVi ADM-9RSS (British, $2300/pair via internet, louder volumes possible, still stand mount sized, comes with basic remote, DAC included, fully active design - one channel of amplification per driver for incredible dynamics, extremely flat frequency response, unbelievably deep/full bass). Depending on taste/room size you may need a subwoofer - check out Parts Express for good/cheap subs. For computer sourcing this is all the "system" you need (if listening away from the computer add Apple AirPort Express for $99 and use a smartphone or iTouch for control) and is the way of the future (that nearly all audiophiles are slow to accept).