Have you checked out the wildgame inovations halo zx6 with angle like the bushnells arc its pretty nice my buddy just bought it for around 100 bucks and it works great and looks cool.
If you wanna spend a little more money i highly recommend the nikon archers choice or pro staff 7 i have the archers choice its awesome.
Ditto Hutch... this is what I use (never used any others... so I can't comment on them). I like mine, but there's probably better ones out there. I think I paid like $149 for mine (years ago).
What's a leupold rx 600 going for? I have one and it's been bullet proof went though a cycle in the wash and came out spotless...also took a drop from about 18 feet...
I use a Bushnell Scout ARC 1000 and I love it. Super accurate and very easy to use. I bought mine at Cabela's (had a gift card) for around $220. I looked on ebay and you can find it for way cheaper and some right around your price range. Bushnell Scout 1000 arc | eBay
Can the WI Halo be calibrated? My cousin has one that is off by about 3yd. Measured it on flat ground using my 300' tape measure. I guess if you sight your bow to your range finder you'd be fine though. Sent from my iPad using Tapatalk