Welcome to the site my friend!
That's an excellent space and budget mate...I'm quite excited for you man. You can create a very cool indoor grow setup with that.
You're a bit vague with your question though, so I'll just give you my initial thoughts.
Get online and shop!!
Seriously though, with that budget, I'd be looking for a 600W vented HPS man.
You will need fans for intake and exhaust. A bigger fan on the exhaust than the intake, or use a passive intake. Get a carbon filter for sure.
You'll probably be wanting to separate that room into 2 areas. Veg and flower space for differerent lighting and cycles. NO light from the veg room must leak into the flowering space. You'll need to budget for some materials to create these spaces and think about how you can vent both areas most effectively.
I'd use flouro or CFLs for the veg room lighting, but you might want to go for a Metal Halide light. Read up on it.
A hygrometer for montioring room temp and humidity is essential. one for each space.
You also need an osciallting fan in each space to circulate the air.
Do lots of research man so you know exactly what you want to achieve from this space. Watch all the videos in the video section on this site, then look for more on the internet and post them on here when you find them!
I think you'll find the Mr Green one very useful as he creates 2 growing areas in one room, it's quite funny too. If you have any more specific questions, just let us know mate.....good luck and have fun!