Ok i think ive reached a decision.
Im going to have a look for a cheap bronica SQB or ETRS for a little while (possibly in vain) ideally a SQB with 150mm lens but really something to get me started for around £200/250. I'm not going to break the bank to go MF but it is something that i think will work for me, i have a fixed short lens which i use 90% of the time on my DSLR which ill continue to use for low light candid stuff and also a f2.8 50-150 lens which is handy for portrait stuff with the digi. My thinking is that the MF offers something different, not that 35mm wouldn't but that MF is radically different and i can add to as and when i need to. It will be something I will take a long time to learn to use but ive found somewhere in the UK that processes a roll of 120 for the same price as 35mm although if time permits i will try and develop stuff myself.
If it transpires that my budget won't permit a MF then I will look to get a manual 35mm set up, im sure ill get a huge kick out of any film format but MF has a powerful lure. Thanks for everyone's help and feel free to add more ideas.