I currently have a humble ( but very musical) A65+ integrated and would like to consider my upgrade options. Can anyone offer some pointers? I was thinking of adding a P80 to bi-amp, but can I use the A65+ as just a preamp or does it have to be used to drive the tweeters when connected to a P80. Is it possible for me to use a P90 with the A65+ ? Appreciate any advice you can offer. Cheers. Ajaz.