Honestly?
OK, this is what I do, not what I recommend:
1) I scan through the forums and dealer sites until my mind comes upon something that says "cool"
2) I go to the Manufacturer Site and see how it compares to the replica my mind thought was "cool"
3) If it's not too off, I'll recheck other dealer sites/"use the search function" to find out if there is some great deal I had missed or some scary problem that will haunt me until the watch dies in my hands.
4) I see how close my wallet and credit cards are to the computer. If they are 1 floor away, I am safe to think about it for a day before I purchase. If they accept PayPal or if it's right next to me----> I AM DOOMED!
5) I wait for 5-14 days, all the while worrying about imaginary evil dealers/customs agents/and mail monsters that devour replicas on their way home to Grandmas house
6) I spend 15 minutes trying to attack the tape on the box trying to figure out how to open it
That's my STANDARD method of obtaining a replica.
Your mileage may vary