I am also doing a project (portraits) on film and decided to get a Pentax 6x7 with a 135 Macro. Bought both for about $300 and so far am very happy with results. Looks like with Tmax 400 and Epson V500 scanner can print up to A2, with a better scanner I'm sure I could easily go A1 with lots of detail. The P67 is much easier and quicker to shoot. Changing film is a bit quicker too.
What's your project?