Here's my current gear list..

Canon EOS 3 (love it)
Canon EOS 1000 (backup, rarely used)
Canon EF 50mm f/1.4 USM (with hood)
Canon EF 85mm f/1.8 USM (with hood)
Canon EF 28-90mm f/4-5.6 USM (used only for the occasional wide shot)
Holga 120S (i have yet to put a roll through it)

I'm looking to spend about $600.00 USD on some new gear, and I'm a bit undecided at the moment. I've narrowed my choices down to three options..

Option 1-
Canon PB-E2
Canon Speedlite 550EX

Option 2-
Canon EF 200mm f/2.8L USM

Option 3-
Mamiya 645E
Mamiya-Sekor C 80mm f/2.8 N

I usually shoot fine art from sprawling landscapes down to macros, and my commercial work consists primarily of fashion (I use a fellow photographer's RZ kit for this), product/advertising work, and the occasional portrait shoot. I enjoy the 35mm format which has worked for me just fine from day one, but I find myself wanting something more. I rarely shoot landscapes anymore (as much as I enjoy them) as 35mm just can't quite capture the detail I've fallen in love with thanks to images shot on larger formats. I like to print big.

Now, I'm looking for some advice. Option 1 would be nice, though not necessary. I prefer to shoot with a grip and I could use the flash, though I can live without both. Option 2 would cure my desire for more reach as the 85mm leaves me wanting (I previously had a Canon EF 70-200mm f/4L USM, but f/4 just isn't fast enough for me). Option 3 would get me the detail I long for and also lead me to purchase the Mamiya-Sekor C 45mm f/2.8 N and other lenses in the near future to build the system.

I'm very tired, so this entire post may well be an intellectual trainwreck. I'll stop typing sans thought here and come back to revise once I've had a few pots of coffee. Thanks for any insight anyone can give, I really appreciate it.