Selecting ebay rails?

[swaneon]

Hello
I'd like some recommendations on what rails you guys what choose between these options?
I'd like to spend under $100
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120959148985&ssPageName=ADME:X:RTQ:US:1123

and

http://www.ebay.com/itm/40CM-15mm-R...ltDomain_0&hash=item4163ec9b8e#ht_3898wt_1002

I am going to be mounting a cat claw
http://www.ebay.com/itm/Catclaw-DSL...673?pt=LH_DefaultDomain_0&hash=item3cc55dc939

on one end and a blackmagic / gh2 on for the main camera

or would something like this
http://www.ebay.com/itm/15mm-Rod-Su...ultDomain_0&hash=item27c8808b71#ht_2206wt_952

and then adding extra rods be better?

Thank you very much.