it sounds like you have never really shot MF...so i would definitely try out every system..rent it, borrow it, use it...i have tried, used and owned pretty much everything from Mamiya RZ, 645, Hasselblad, Fuji, Rollei...everything is different (much,much more so then canon/nikon) and everything has its pros and cons....but one thing they all share: it is a way more "involved" workflow then 35mm (or DSLR)..slow, heavy...and totally worth it..for me...i personally hate, hate, hate the H1/2 system (and actually like the lenses)...most people love it...it comes down to what you like the best and what works for you...same goes for backs: i have owned leaf and phase...both have their drawbacks...if i would buy one right now, i would take a hard look at the emotion...is it the best? who knows! but i think for me it would be the best compromise right now..but i am sure that will change by the time i am ready to upgrade and when i am ready i will check everything out..personally...as much as i respect people's opinions in forums like this one, everybody needs different things and everybody works differently....you will probably have answers once you look at all systems (there aren't that many choices anymore anyway...)...do oyu shoot studio, location, fashion, landscape, people, stillife,....
i have a rollei system with the P20 right now...i shoot fashion, people...so resolution is not that critical (the P20 cropped still prints 16x20s without any sign of "digital" or anything else funky)..i need a back that shoots at least 45 shots a minute...i need a versatile system with a wide range of lenses (rollei has that, but as many will point out, no rental service...pretty much anywhere...does not matter to me, i own my stuff, with back ups)...i can even get a X-act system and use the lenses and film and digi-backs for true 4x5 like shooting...i love the camera, ergonomics are great and synch speed is 1/500 or 1/1000, both of which i use all the time, only H1 can do 1/800, mamiya, contax 1/125..to slow for me....AF is not an issue for me (rollei has it), but i find all sytems pretty much suck compared to canon and nikon and i even use MF on the canon....the rollei bundle can be had for 10.900 from kurland right now (i got mine there..over ebay)...if you need true wide angle or shoot landscape (for micro detail) this won't work for you..although rollei no has a emotion22 bundle with emotion75 upgrade path...
i would strongly advise to play with this stuff before buying...not only in the store...
as a starter i would also look at the mamiya 645afd..great camera, GREAT lenses, downright cheap on ebay...can't go wrong...why not for me? synch speed, no WLF...
why i hate the H1/2: worst ergonomics of any camera i have ever seen, crazy overpriced...cheapest materials i have ever seen on any camera...i just bought a sony DSC-R1 (great camera by the way), it feels solid and well thought out compared to the H1/2 buttons where they are supposted to be, handles great..and oh: the lense hasn't fallen apart yet (sorry, that was a low blow...i was so excited about the H1...i loved my fuji glass (gx680), thought this would be THE new MF system...my expectations were too high i guess...)...end of rant