well, this i think mine is the most obvious answer ever :P
Antara, my dearest and closest friend is my most passionate reader. she is the one who actually READS every single one of my posts and leaves a comment that always makes me smile :) her reviews are very honest and sincere. i know it for a fact that she doesn't miss out anything because if she isn't able to comment, she would give her feedback personally via sms or on phone :) and she even reads the stuff i DONT post on my blog :)
well of course i wait for her comments all the time; sometimes i even beg her to tell me what she has written when i am unable to open my computer... she doesnt of course :P
if i am not able to read Antara's post it is due to some EXTREME reason that she understand :P the thing you mentioned never happened cuz i CANt keep myself away from her blog. I love it. I even go there daily now, though she has stopped posting for a while :) so you see, we are best friends forever in EVERY aspect :)
other readers of mine- Leo of course, though he doesn't comment :P and DS :) i simply love his comments- heartfelt as you said. anddd i have other readers as well, Haiku readers to be precise- Grace, Tarang, Becca who dont miss out a single haiku of mine :) (thanks to your Haiku heights leo :P)
blogs i follow passionately- oh there are loads and loads. most blogs i read, i follow passionately. but the blogs which show up in my most frequently visited are- Antara's, Leo's, Sam's, D2, DS and yeah Untitled moments by Layla :)