I forgot to give you my 'why'. MY why is largely because i need cows with a little brahman influence to deal with the bugs, heat and humidity and/or drought and also i just like eared cattle. the beefmaster has all the positive brahman characteristics (and are extremely gentle) that i need, the rustling ability of the hereford and the fertility and maternal traits of the shorthorn (basically an angus, lol.) i would personally rather have a large percentage of british breeding in my brood cows than continental because moderate sized cows are more economical, and from my experience tend to be more fertile (b/c they dont have to maintain a large frame, they can put more energy towards their calf and rebreeding.) i prefer to use continental breeds as terminal sires.
ive had experience with a lot of your more common breeds and basically the only ones ive found to be worth keeping as mamma cows in and under my conditions are beefmaster, brangus, angus, and brahmanxhereford f1s. i wouldnt mind buying some hereford cows (they are cheap here) and putting a brangus bull on them though. We got away from the hereford years ago b/c of pinkeye and cancer eye, but with the beefmasters we are having more hereford blood show back up in the calves and have been pleased. we have been using beefmaster bulls since 91 but use angus, simmental, charolais, and LimAng from time to time on beefmaster cows. its easy to stretch out calves with the right bulls and still have a medium size cow.