If you only want one way tickets (that wasn't clear from your initial post), then booking through UA is probably your best option. 200,000 UA miles will get you 2 business and 2 economy saver tix on UA metal (220,000 for NH operated flights). If you want 4 business seats, that would be 260,000 on UA metal, 300,000 on NH operated flights. You can transfer Chase points to UA if necessary.