Please help verify new sprockets & chain info.

[socialDK]

I want to be sure I got this right.  I plan on going down 1T on the front for better acceleration.

I'm buying
15T front sprocket
39T rear sprocket
520 110 link o-ring chain (brand undecided any suggestions? Bikemaster prices are low for an o ring. Someone suggested a RK)
And if I find a cheap one perhaps a new helmet maybe?

Do I have to buy the master link separately or does the chain come with it?

I used the chain length calculator from the wiki site which said I need a 109 link which isn't available.  Does that mean I need a 110 standard chain?

Thanks!

[ineedanap]

You have everything correct.  The chain will come with either a rivet or clip master, but not both. 

[socialDK]

Thanks.  And a follow up question.  Do I need a master link tool to properly set the master link for both a clip and rivet link?  What is a good master link press tool?

[jeremy_nash]

whenever I install a chain, I always buy a second master link.  it's easy to have the clip go flying over your head!