Dont know about 29er version but i think saying small block 8 is rubbish is a bit too opinionated for a tyre discussion. Again, dont know about 29er versions, but i the standard non-tubeless KSB8 tyres with sealant.
i prefer small block 8 over ralphs as i feel that they roll faster and have more predictable handling on courners. They dont seem like the tackiest rubber compound though.
I dont bother with stans sealant, its a rip off and doesnt contain any solids/fibres to block large punctures. Have a read up elsewhere on what sealants to use, there are loads forum threads with various sealant tests. Dont use car/motorcycle sealant (i am talking about those emergency fix bottles, not the green gloop), some of these contain highly toxic ethlyene glycol, they are also a 'one use' sealant which wont peel out your tire (i have tried it).
I would suggest having two sets of tyres at least. I have done the whole, using one set of tyres for a whole race season thing, it doesnt work. If its the whole taking the tyre on and off problem, then if you are using well fitted tubeless tires it wont be a problem you can prob pump them up with a mini-pump (i have pumped up converted non-tubeless tires with a mini pump before). If you are using tubeless conversion tires, then just take a high volume pump and plenty of sealant and you will be ok. If you are going to use one set for everything, then something like ralph on the rear and rocket ron on the front. but rocket ron is going to handle rubbish in very dry hardpack/rocky conditions.