We have just come back from a trip to Northumberland, to look at a variety of sheds are we are thinking the exact same thing!! It boils down to whats going to suit you, your farm and your budget!
As far as we saw it, there are three types of sheds- straw bed based, cubicles and slats.
Straw bed based sheds are multi- functional, with the ability to store fodder, kit and other stock, they have a variety of alternative uses, but the bedding does cost. alternatives to straw are woodchip and paper.
a good design that we had not seen before, was a barrier-fed straw bedded shed (dont say that too fast!) . A strip of about 3-4 meters of concrete ran alongside the feed barrier (inside the shed), the rest of the floor chippings/ scalpings. this allowed the bed to drain a lot more freely, reducing bedding costs. the strip can be scraped either daily or weekly. the floor didnt get dug or churned up during cleaning out- obviously dont dig the bucket of the tractor right into the floor!
cubicle sheds save a lot on the cost of bedding, but scraping them out daily takes time (by the time you have shifted the cattle etc). the sheds cannot really be used for much else either.
slats have minimal labour costs (cleaning-depending on how deep the pit underneath is- takes a couple of days a couple of times a year), and you are not having to spend any money on beding. however, you cannot put the bull in with the cows on a slatted shed as he cant get the grip to mount her, so he will either not try or hurt himself if he does. this is a good point if you are keeping bull beef though, as they do not bully each other.
Alongside each of these systems an area for the calves can be penned off- ideally this will be straw bedded with a creep feed in.
We also went to Cumbria University and saw their cattle roundhouse- i will start a new thread about that as it was hugely interesting and there are quite a few photos!! that is for store cattle though, not sucklers.