Budget Receiver for huge room

Hi, I haven't been around the forum in a while and am a little out of the know on what people's opinions on various receivers has been recently. Anyhow, I'm in charge of selecting equipment to make a theatre in my college's Knights of Columbus hall. I am looking for a receiver under $500. Either the Pioneer 1017 or the Onkyo 605 seemed like they might work. The analog to HDMI converting of the 605 would be nice but is not completely necessary. The room we have is quite large (30'x15'x12') so we need a good bit of power though so this might sway the decision although we can't afford separates. We will most likely be purchasing Ascend Acoustics speakers as a side note. All recommendations are greatly appreciated.

340s for the mains and center, and 170s everywhere else with a Hsu V3 Turbo (with the room size I'm assuming that's fairly necessary) If you have suggestions for speakers that might better fill the room for the same cost or less as well feel free to mention a name or two and I'll do some searching in the proper forum If you think the 605 might not be powerful enough, would the 1017 fit, I know Pioneer likes to overqoute their ratings a lot but they also increased it a ton since the 1016. Thanks!

That's what I was thinking (hence the sub choice) but I haven't worked with a room that large before so I wasn't sure how much I needed.