Cathedral ceiling and 'open area' to me are red flags that you'll need a decently beefy sub. If the budge will allow, consider an HSU VTF-3.
For receiver, I'd say either Denon or Pioneer. For the money, you just can't beat them IMO. The Yammy isn't bad but IMO not the same.
For speakers, personally, I think the Ascend Acoustics little 170's are a killer speaker for the money. Cross them over to a good sub and they'll amaze for the money.
Bryan