"Best solutions" are subjective if the requirements aren't clearly documented. If you consider the triangle of cost, time and quality then if you move one you move them all - if you find a good construction PM who knows how to deal with trades and also is incentivised on cost saving perhaps, then you will be more likely to meet your outcome.
You can get one quote or ten quotes - chances are they will all vary by up to 30-40% across the range but unless they are all for exactly the same item then you can't do a comparison by price alone. Getting ten quotes will also take time, and you will get some that quote off the envelope as they just don't want the work.
I've found the industry also works through networks and a good PM will have a black book of contacts - they will also be known to suppliers who will know the first price needs to be the best price and this cuts down the hassle factor.
Decent PMs charge upwards of 10-15% of contract value but can easily save that and more on a build but you have to be prepared to let some of it go and let them have the authority to make decisions - if you can't see yourself doing that then going the PM route may not be for you and the alternatives are turnkey or main contractors.