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6/8 or 5/8 are both good sizes to start with. I would recommend getting one with a round end on it, your ears will thank you.
In my opinion, the Ralf Aust 5/8 is better than the Dovo 5/8, but both...

Welcome to SRP from down the mountain!
If you want to go with a new straight, I'd recommend getting a starter kit from straight razor designs. Any of their razors will work great.
If you want to go...