For your budget, you can look into SPT subaru performance technique. I believe this is the mid priced dual exhaust for 08+ But keep in mind this is 2.5 inch piping. MOST would recommend full 3 inch exhaust system.
The cheapest I believe would be the TurboXS when they came out a few weeks ago for 300 + shipping but the price already went up.. so I guess it's mid price just like SPT haha
Next, I believe Magnaflow has a great sounding dual system.
Next would be the Perrin dual. Very pricey but everyone that has it, can't say anything but good things about the piece.
Also for the intake, yes, I also heard it should require a tune but I also hear the stock intake flows much better than steel/aluminum material rather than the rubber OEM airbox. The short ram or cold airs only give you that cool "slight spooling" noise as you climb through the RPMs and makes your STOCK blow off valve more noticeable.
Do you only want the subie rumble? Then you should stick to the cat back, not turbo back.
Believe me when I say this, as soon as I put on my cat back. I immediately wanted more. So I bought a downpipe.
If you also want a downpipe in the future I would recommend buying a good cat back and pair it with a catted downpipe(depending on where your live, emission restrictions, etc) then save up for a tune! Your options should be; open source tune, non professional tuner. 200-350 ??
Next would be the Accessports by several companies. Pre-loaded maps for your ECU, direct plug and play 450-550?
Or you can go pro-tune. Have a reputable Subaru tuner go to work on your beast with their dyno. I think it's 600 + ?
That should be a well 1200 spent, mate. good luck!