American Brown Ale help

Hey everyone, I keep hearing mixed opinions about Pacific Gem hops, so I wanted to try and use some in a Brown Ale and mix them with Willamette hops although I'm not too sure how it will come out flavor-wise. Does this look alright so far? Is this something worth trying?

Ingredients:
12.25 lb 2-Row
.5 lb Caramel 80
.375 lb Caramel 40
.375 lb Chocolate malt
.375 lb Special B

.5 oz Pacific Gem (15%) - 60 min
.5 oz Willamette (4.8%) - 10 min
.25 oz Pacific Gem (15%) - 10 min
.5 oz Willamette (4.5%) - 5 min
.25 oz Pacific Gem (15%) - 5 min

1 White Labs California Ale 001

I can't speak to the Pacific Gem, but I like the grist and have used lots of Willamettes - they'll give a spicy, almost minty note in a darker beer when used as a late addition. If the Pacific Gem flavor compliments them, I think you'll have a very tasty brew.

What temp would you mash at? That Cali Ale yeast is pretty thorough, right?

Thanks. I've read that Pacific Gem has a good citrus aroma and some woody and a subtle "blackberry" taste to it. So it should go with the Willamettes nicely, hopefully.

I'm looking to mash around 152, but I'm not quite sure yet.

The Cali yeast gets about 73 - 80% attenuation.