Digital Camera - Q & A

So I have a choice to make... I was shopping for a new flash and it comes down to 2 choices:
1) Used Sony HVL-F36AM flash @$100 used
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pros: Sony brand flash (more reliable)
cons: weaker, no LCD, no swivel, no manual mode (important for me), used, no warranty

2) New Opteka EF600 @ $105 new
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pros: stronger, manual mode, LCD, swivel, new, warranty
cons: Opteka quality?

basically I'm choosing between a new flash by some 3rd party that has more features or a used Sony flash with very little features... the $5 difference in price doesn't matter... it seems that the Opteka flash has so many more pros than the Sony flash, but the one con of Sony vs Opteka is pretty huge!!! Which one do you think I should get? I've had 3rd party lenses and they've done well for me (Tamron and Sigma) but I keep reading bad things about 3rd party flashes failing... anyone have any input on this? thanks!