Thanks for the replies again
Another pro argument for the PB-2000 is that today someone at a local store told me that a ported sub should dig deeper and more firmly than a sealed sub at lower volume levels - which would be just perfect for me, for music at least.
As for AVR's - the models I'm going to audition ( with fronts ) and I got highly recommended are Marantz MCR610, Marantz 5005, HK 3770, Yamaha R-N500, Teac 750. They have what I need - apparently good sound quality, easy connection to the PC, sub out, just brilliant.
If they don't include the Audyssey - I should be able to tune the sub to my liking and room environement "manually", right ?