It really depends on what you want. I like and use McMillan, Manners, Grayboe, HS Precision and Bell & Carlson for synthetic stocks. There is an extra charge for an adjustable cheekpiece, a synthetic will need to be bedded to get the most out of it and detachable bottom metal purchased if a magazine is desired.
A chassis is generally plug and play. With the chassis you have the adjustable cheek piece included, you will save on the cost of bedding and there is no need to buy the DBM as it is integrated into the platform. I have used many of the chassis that are on the market and feel that the KRG Bravo for $350.00 is hard to beat. A decent M5 DBM is $160 by itself and a quality bedding job will run $150.00 plus....