Thanks for the great responses and interesting options to consider. Sorry for the tardy reply, I am currently in the USA catching up with good friends, it been pretty hectic and the odd headache from one glass of wine too many and late nights....err early mornings.
Whilst I have been here I have managed to get a MXL-770 large condenser mic and SM-58. My mate here has a Behringer analog mixer and some descents monitors so we tried the 770 and 58 out just to check they are working before I head back to Oz and they sound great. I got the 770 for $73 on Amazon Prime delivered to my mates place. I am amazed at the performance for the price.
Still yet to decide which USB interface to run with. Its become a bit like a Chinese menu with the options that are available. When I get back hopefully my BIAB Everything would have arrived and I can start getting my head around that.
Definitely want to have a look at the included DAW that is incorporated in BIAB before deciding which USB interface to run with, if for whatever reason the BIAB isn't the preferred DAW I would possibly be influenced by the included "light" versions of Cubase AI or Pro Tools Light etc as to which USB interface to go with.
Have not ruled out a small mixer just to manage all the other sources, monitors etc. the mixer as Tobias mention needs not to be USB. I sold on a dedicated USB interface for the DAW just not which one at the moment.
Happy not to rush into what DAW, USB interface, monitor speakers, possible mixer etc until I get back and qualify exactly I am going to need to manage initially by way of I/O's and have a little think about what might happen in the future so as not to box myself in with the just now requirement. Time to get some butchers paper out and scratch out some drawings with devices, signal and work flows.
Also have taken on board some of the comments relating to the room acoustics. I probably have two wall surfaces that are likely going to need some acoustic foam treatment. I have nice dense curtians that cover windows on the other two sides which will soften any reflections. Need to get back with the microphones and do some tests.
Another 3 days here and then back to Oz. Probably won't eat or drink for a week when I get back to offset the insane hospitality I am experiencing here with my friends!
Thanks again one and all for all the fantastic input, it really is appreciated. Again my apologies for the tardy reply to all you great responses.
Regards,
Ian