Hi
I own a Quad 909, im actually particularly impressed with the bass performance. It offers the full package soundwise. For the first time I have an amp that i haven't found any quibles about, sonically.
As you specifically mentioned the bass. It sound presents an immense authoratative control of the loudspeakers. Bass extends very well. I would say it probably performs better in terms of controlled accurate bass reproduction than providing a good 'Slam'.
Indeed it does depend however on how much you are paying.
I paid £425 for mine from Hughes Electrical, as it was the last one off Display, together with a 5% Managers discount on the day. At the price, it's no doubt that its the best performing.
It's worth shopping around because its still possible to get hold of one's much, much cheaper in Silver if your interested and don't mind the Silver colour. In Hughes case they were discontiuing the Quad 909 in Silver as "Black is the new Silver" apparently. Here is a link if you dont mind eBay Shopping.
I cant say for certain whether or not you will find better performance from a Power Amp, around the £1000 RRP, as im sure your already aware, its very dependant upon your system you have + your musical tastes. The System that i have used the Quad 909 with is listed below.
I doubt the competition would be much better.
But as Clare suggested i would try a demo. Try a home demo if you can.
Regards
James Piper