I don't have specific answers - but I will 'comment'
Resaw hardwoods - this is one of the two toughest requirements you lay out. Small pieces should cut well on pretty much any BS, larger work requires careful set up, the right blade, and being able to tension the right blade (meaning a capable saw). So if you want to resaw 12" wide veneer from a prized board, I'm not sure there is any shortcut around the setup work (assuming saw is capable of it).
Tight curves - any saw should be able to do this with a small blade (meaning any saw would be able to tension a small blade well enough to do this). I think the key to scroll work on a BS is to never provide lateral tension on the blade (i.e. never push against the side), but I am certainly no expert here.
Dust collection: an issue I am struggling with somewhat on my own Jet 14" BS.
For normal BS use (cutting <6" thick pieces of dried lumber) my DC hose to collection box under the table (kludged together) works alright. However, cutting in thick, wet wood (i.e. cutting log sections for lathe prep), I accumulated so much stuff around the bottom wheel that it started tracking up with the blade on the left side blade channel. This was not just dust, but wet curls, some dust, and dirt etc from the bark. Clearly this made it past my DC box and into the bottom wheel well. My point? Effective DC depends on what you are cutting.
Perfect DC on a BS is quite elusive. I suspect a good solution likely requires attachment below the table AND in the bottom wheel well (front cover of the bottom door?). Even with that, a top side collection point could help as well for some cuts.
Find a BS with all that - and couple with a powerful DC system and I believe you will be on your way. Newer model BS designs seem to incorporate DC attachment into the design. Of course I have not seen any bargain saws off Craigslist in this category.
As Hank's post above suggests, you may need to define a few things to narrow your choices. For a custom furniture maker a 30" Tannewitz saw (sp?) may be a requirement; for others, making say jewelry boxes, a well tuned 14" saw works great. Throat depth, resaw height, and blade tension capability, together with your budget (ballpark) that are helpful to know.
Hope that helps
Henry