You don't have to push quark7 very hard to find its limits with transparency flattening. If you can avoid too many background elements, any sort of rotations and have the text on top (oh yes and avoid mixing objects with different color spaces) then you'll be fine.
I took advantage of the upgrade to v7 and get v8 for free offer so for me it was worth the cash
v8.1 is the best version for a long time, Exporting Native transparency in PDF is a double production boost, it gives reliable results and is much much faster. On the downside 8.1 still can't place and retain native Transparency PDF, has cripplingly limited options for dealing with placed PANTONES, and no Separation Preview. You can download a demo of 8 and run that without disrupting your 7 install, bear in mind that v9 will be along in due course.
... there was the puzzle of why the sun came out during the day, instead of at night when the light would come in useful.
Terry Pratchet