I've ordered from both Freshops and Thyme Garden. Both were great companies, I like them both the same. Go with who's cheaper?
My Chinook is a STRONG grower. Significantly stronger than any other hop I grow.
Having said that I strongly recommend you grow a hop you use. If Chinook grows well, and you don't like it, you have a lot of nothing. If you like Chinook, grow it. If it's like mine, it will out grow anything else you plant.
When I started I planted two rhizomes in each 'hill'. So your plan of '2 of each'- 6 total sounds good to me. I would plant the two rhizomes together in one hill. As young plants, this increases the chance that they will survive. By next year they'll have merged into one larger crown. The two in one hill basically hedges your bets and better ensures you'll have success.
There are a lot pro's here. People that have a lot more experience than me. There are a few other guys in Chicagoland that know more than me and are better growers. I have around 14 plants in my yard. So in Aurora IL, I'm the hop guy. I mainly point that out to say if you have any questions I'm happy to answer them or help out in anyway.
I haven't done any digging yet, but *may* have rhizomes to give away this year. To Be Determined....