want to build a 2 channel system where do i start

With the amount of money you want to spend ($20,000) you should be able to built quite a nice system. If it was me with that much money and wanting to know where to start, I find a good, well-established, hi-end dealer with a good reputation for sales and service, and between the two of you build a system that meets you listening wants and needs. Granted it will cost more to go this route, than buying used, but then again you're paying for the dealer's experience and expertise, and a good hi-end dealer can help you avoid many expensive mistakes in putting together a good system. Of course, this advice is considered somewhat "heresy" over here on Audiogon, as many of the people here are seriously into the "buy/sell" game, and would like nothing better than getting another "player" into the game. One more piece of advice, remember in the final analysis, it's about the music, and not so much the gear. The gear itself is just a tool to get you to the music. Unfortunately, there seems to be many that have forgotten that fact.

for starters, just because you can spend 20K is no reason to feel like you will not be satisfied with a less $ set up. listen to more modest systems at any number of dealers. classical rock recordings in original formats are generally not that well recorded and really accurate and pricey systems will reveal this. if you announce your budget you will gladly be serviced to leave you with $1.47 as you leave the shop. take along your favorite albums or cd's and try not to listen to anything but the MUSIC and if that is the way you want to hear it replayed. lotsa folks want to feel like they are golden eared audiophies but in my experience it is an ego trip for most. the law of diminshing returns is a major thing to consider in this marketplace of goods. lastly, your listening room is ultimately the determining factor so do not overlook acoustic treatments for this space. have fun.

Good advice from Veroman - don't lead with the chin. I would add, start with the speakers. Narrow your speaker selection to a few models. I would not limit myself at the outset here - consider floorstanders, monitors (maybe with a sub) - also give a listen to the traditional passive boxes, actives (speaker and amp matched in one box), planars, etc. Then look at the amount of power you will need to drive the different models that you have narrowed to, at the listening levels that you want, in the room you are going to be listening in; that will be your biggest initial concern as to an amp - preamp / integrated. Sources I would look at last. Amounts to spend are kind of fluid, but with a 20k budget, somwhere under 10k for the speakers would be a starting point. Also, quality vs price do not necessarily go hand in hand, especially with speakers which will depend a lot on your personal tastes. You may find that you will be able to put together a system that you are happy with for much less than 20k as opposed to a more expensive system. Probably the best advice I could offer is 'patience' - take your time.

thanks everyone for the advice as i am new to this hobby and dreatly appriciate the input