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Thanks!
$300 is fine for CPU loop but might be tight if you want to add your GPU's.... Mine hit $300 for CPU only before I knew what hit me (meant to go for $200)
What do you mean by double-charge?
I pay with my credit card. Charged in USD but converted by Mastercard to CAD (they take a spread of $0.025 or so). Meh. The great deals are worth it and I pay max 1 tax (not sure if any, can't remember....)