Is there a 'preferred' amount of $/multiple-of-bet-unit to buy in with at a table? I've always wondered if it's better to buy in with little (because you start betting a single unit) or a lot (because you will bet many units when the count is high). I usually do around 200-300 if i'm at a 25 table (spreading around 1-5/6 at a DD table).

Thoughts?