Gotta go with Simon, pick something you can live with. I understand why you are asking this question, though. I can tell you, it's a little embarrassing having a stereotypical "ftm" name - I picked mine before it became really popular amongst trans men, but I'm honestly mortified when I see the bastardized spellings of my name popping up everywhere. I hate when people comment on my name because I feel like it might, in time, lead to people "spotting" me (which may be unfounded). But, as I see it, this is my name now and to pick a new one would be such a big hassle that I'm just going to suck it up.
I've heard of a few trans guys named Silas and Benjamin, actually - never met a cis guy named Silas, but I know enough Bens. I also second the other piece of advice from Simon, which is be aware of name trends in your generation and choose ones that guys your age would have.