I'd be grateful for some advice/tips. I'm moving into semi-pro photography after a long career break and I need a new DSLR. From my past-life in film photography I have several lenses best suited to full-frame. My only EFS lens is a 17-85mm f4.0 IS. Question is, on my budget, should I (a) get a 50D and a new lens, or (b) a 7D and use it with the 17-85 EFS, or (c) a used 5D markI? Budget is £1200 (but I might want an upgrade to my Lightroom 1.1 too!). I'll be shooting studio portraits, mainly, but who knows where it will lead. My other lenses are all canon EF and are a 28-105 f3.5 IS, a mediocre 70-200 IS, a nice 85mm f1.8, and a 100mm macro. many thanks.