I have a transaction I want confirmed asap, so I'm willing to reward a miner/pool 0.5 BTC who can include it
I have doubts about you being serious or not but you are wasting your time.
I can 99% guarantee you that your tx will get included in the next block if you add a fee of 0.20 BTC.
You will save yourself 0.30 BTC. Keep that in mind the next time when your tx has ultra high priority.