TT Sub is a typical newbie purchase. 3 of my 4 first reps were TT Subs. Having owned 2 TW versions of the TT Sub, and one Chinese... I can tell you one thing: Don't bother.
The reps are nice, and the pics might look great... but the two-tone Oyster bracelet doesn't cut it. The color and quality feel simply isn't there.
If you don't mind having a nice looking watch, but fairly obvious rep (that all gold experts would call out under closer examination), go and buy it.
If you want a rep that's believable for 99% of the population, get good all-stainless version... like Noobmariner.
PS: There are much better options for a TT replica, like Breitlings that feel naturally heavy and solid. But if you absolutely want a TT Sub, and will buy one no matter what... go for the TW/MBW version. The bracelet is better made than the Chinese.