If you're OK with a jacket, an Aqualung Pro HD should price right around $500 or 452 EU.
There's also the new ScubaPro Equalizer - sells over here for $530. I've never seen one..
Both models offer weight integration.
If you can get Zeagle products there, one of their jacket models - the Bravo - also sells for $499.
One other to look at is their Express Tech Deluxe. a modular soft back plate system. Configured for
single tank with their Zip-Touch weight system it;s $482 - $385 with no weight system.
You can add most of their larger wings later to dive doubles - the soft back plate will mount them - or they have a $70 hard back plate option. Folds small if you ever do travel. It's a minimalist system - most people add pockets etc as needed, Zeagle's are pretty pricey but other brands work.