I'd just just plain water for now, it's not cold enough to freeze and you're not driving the car far! Removes any risk of a reaction between the two. I always use Distilled water in my coolant to avoid the risk of scale build up but I'm not convinced it actually makes any difference!
Either of those should be good, I don't know much about Slowboy but Surrey Subaru have a very good reputation.
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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