The thing with most info on rifles is that, as always, personal preference comes into the advice most folks give you. Also, the advice given by the 'experts' can be very much influenced by the current hot make or calibre.
Start from your intended target. Decide on a calibre, in this case .223, decide on a range of bullet weights suitable for your chosen target, then decide on a twist rate and acceptable barrel length. After this have a look at makes and models using your wallet to temper your lust. If you can, speak to those who have similar models and if possible get a shot or two. That m