My buddy just purchaed 1501 2 weeks ago so I can give an opinion.
His 1501 is used to drive B&W 6 series towers and there was more than enough juice and overall sound was pleasant. Having said that, the metal dome tweeters of B&W gave me a headache after a while & music did lack some "air" compared to my system. But this reason could have been easily his source (PS3 & low quality mp3's)
If space isn't a restriction, I personally would go for 5004 (i'm eyeing out the 6003/6004) strictly because you get more wattage.
Also, he said his 1501 sound much better than his 2 channel NAD 315...hope this give you a better idea
His 1501 is used to drive B&W 6 series towers and there was more than enough juice and overall sound was pleasant. Having said that, the metal dome tweeters of B&W gave me a headache after a while & music did lack some "air" compared to my system. But this reason could have been easily his source (PS3 & low quality mp3's)
If space isn't a restriction, I personally would go for 5004 (i'm eyeing out the 6003/6004) strictly because you get more wattage.
Also, he said his 1501 sound much better than his 2 channel NAD 315...hope this give you a better idea