Well, Polk Audio makes some of the best components and for the money you really can’t beat em.
MBquart components claim to be the best and of course they are the most expensive.
There are quite a few other quality component speakers on the market.
Like the Infinity Kappa Perfect and JBL makes some good ones. Also checkout Focal, they seem quite good.
The honest to god truth is save your money and buy a middle of the road component set. Then take the money you saved and invest in some solid sound deadening and custom install yourself, so you get perfect imaging. Use a crossover or an EQ to fine tune your components and you should have a quality system that could compete with most show quality installs. Plus you did it for half the cost and that is the whole point!
If you get the chance go to an audio shop and listen to some of the component sets. Also check out local car shows. They’re a great place to find quality component installs with great imaging and effects. Let you ear be the deciding factor… and if all else fails, buy a decent set of cheap components and install them like I said, with plenty of sound deadening, you will be better off than most. Plus you can always upgrade.
Good Luck
Seth