Eastern Europe train options

[aliz]

so, I'm getting to the exciting planning & booking stages for my july trip! yay!
I'm a little stuck on trains though. the trips we would be doing are:
berlin -> warsaw
warsaw -> krakow
krakow -> bratislava
bratislava -> budapest
budapest -> vienna
vienna -> prague
prague -> munich

as far as I can understand, buying a eurail pass would be pointless. am I right? however I don't want to spend my holiday worrying about whether I'm going to be able to get a train! from my experience in the czech republic before, I know the trains aren't terribly reliable, and I'm sure there are cheaper options, but I really love trains so I don't want to bus the whole way around - I'll do it for some journeys if its a huge saving, but I'm happy to pay a little extra for the train. I just want to know if I need to book any trains before I go, how much I should expect them to cost, etc etc. I've only ever traveled on eurail passes before!
thanks guys any help would be appreciated!