I chose Wonder over Winged Sliver because it's easier to develop... it doesn't require you're creature drop for the turn (since you discard it to get another creature), and it's 1cc less. This is why I'm running 1 Talon Sliver rather than 1 Valor. Right now, I'm still testing the merits of Wonder vs Winged and I'm not entirely sure which one works better in more situations. This could go either way, I still need more testing.

Well, I think Harmonic is still a great option, but I don't see the deck needing the virtual artifact/enchantment answers maindeck, and if it does, I'd still want to keep Sex Monkey. The Sex Monkey answers the maindeck Pithing Needles of Threshold, while Harmonic Sliver defeats the purpose. It also blows up Vial against Goblins without destroying your own Survival. Harmonic shines against decks with a higher density of artifacts/enchantments, like Affinity and Faerie Stompy. Against these decks, I think sideboarding in Harmonic Sliver will be suffcient (although this needs tested).

I never found myself ever wanting Genesis in playtesting but he may still be a good option vs 4c Landstill with Pernicious Deed... but I think he'd be more appropriate in the sideboard (again, this needs tested).

Talon Sliver is important because it allows you to combination block large creatures while you develop your board position. Playing Survival on turn 2 slows your tempo down a bit early on and it takes a few turns to establish a creature base that will outsize Werebears and such. Talon Sliver allows you to block with 1/1's and 2/2's to keep them from attacking. This won't always be the case but it has helped me to survive a few situations where I would have died because my opponent had too much of a tempo advantage. It may not be extremely important, but as a 1-of, it's not bad (again, needs testing).

Essence Sliver and Ward Sliver, much like Sliver Queen, seems like overkill. I may be wrong, and Essence Sliver may in fact be a great idea, I'm just not quite sure if it's necessary. Talon Sliver and Crystalline Sliver > Ward Sliver (for sure), but Essence Sliver could be a very good option for recovering from an early game ass whooping. I had considered Dark Heart Sliver in the board but Essence Sliver seems like it would be a stronger option vs things like Burn (again, needs testing).

Does anyone even run Psychogenic Probe? I mean, even if in some rare circumstance they did, Sex Monkey would answer it if my countermagic didn't.