bianca: hi.. i plan to build this system any body already listen to this sytem.any advise if this good for the future.Hi
If you are fixed on the Quad system, which is a good one, do try and have a listen to a few speakers with that system. Speakers differ so largely that there will be speakers that some people just don't like.
Firstly, if you're looking at two 909's, you could consider going for the 909 monoblocks, depending on which speakers you're looking to drive. If you want to stick to the two stereo 909's, it would be tempting to use the funds from the second 909 to get some better speakers - you could always add a second 909 at a later date, which is how I would be tempted to approach the system.
If this is a possibility, you could also look at the Proac D28's, which have been an extremely popular speaker recently. Are you limited to floorstanders? You could try out the KEF Reference 201/2's, which work very well with a 909, and will improve immensely adding a second 909 later on. The Monitor Audio Platinum PL100's and the Tannoy Definition DC8's may also be worth a look too.