OK my 2c worth. Or rather my mechanic's 2c worth. He has been building, servicing and repairing bikes for about 35 years as well as riding and racing both MTB and road bikes. So he knows his way around bikes pretty well.
He rates Specialized frames very highly, amongst his collection of several hundred bikes (n+1!
) he rides a Specialized Roubaix and recently took great pleasure in building up a couple of Tarmacs for myself and a friend.
He doesn't like the press-fit cup style (BB30 etc) type of BB because he says they creak. He prefers the threaded type BB.
He also recommends Shimano components, Ultegra if you are on a budget or Dura Ace if you can afford it. He always specifies Dura Ace 7801 chain, reckons they are better than the later 7901 version. He is also not a fan of removable quick links and flatly refuses to fit them! Side note - the early Shimano 7901 chain came with a factory quick link which was discontinued not long after release, so there must be something to this.
He is also a big fan of Thomson seatposts and stems.
And also Dura Ace C24 wheels. He doesn't like Mavic wheels, in particular the hubs.
He works from his very well equipped shed at home, used to own a bike shop but decided he didn't want the hassle of a retail environment so just builds and repairs bikes these days. He doesn't stock and bike parts except for cable, ferrules, barrell adjusters grease and lube so he is not just saying this stuff because he makes the most markup on it, it is simply because in his experience these parts are quality. He is not a weight weenie either even though he is a very successful A grade Vets racer.
I can give you contact details for my mechanic if you would like to discuss any of this further with him. I have no connection with him except having several bikes and countless services and repairs done by him. I don't get my work done any cheaper by talking him up to others and he doesn't need any extra work, he is already flat out even though his only advertising is word of mouth from satified customers. I'm sure he would be happy to give out advice.