The Ushio 14K is really a 10K. If you want to go bluer, it's not a great choice. But it has good par and is a quality lamp.
I disagree with the comments on the 150 watt Ushio 20K being "very" blue. It's a beautiful lamp in my opinion and one of the whiter 20K's with a blue tint with a hint of actinic. Not an overwhelmingly blue color at all. The Phoenix is bluer and, like some others, I find it to be a very monotone blue in both 150 watt and 250 watt DE versions.
That said, the Ushio 20K does not have much par. The Phoenix has higher par despite being bluer.
If you want a whiter lamp without much blue but no yellow, the Iwasaki 20K is a crisp, white lamp. You will probably see just a hint of blue in it coming from 10Ks.
The Iwasaki 50000K is a white lamp with no yellow and an actinic/blue tint. It looks more like an actinic violet tint than a blue tint so it is a pretty unique looking lamp and you may or may not like the color. Does have pretty good par though.
The Iwasaki 50K and Ushio 20K are among my favorite color lamps despite being very different. I am not a fan of super blue looking tanks. I like a cool crisp white look with a blue hue but not a tank that looks like windex or ty-d-bowl.
Just my 2 cents.