cryptokittydex.com
A website tool where you can see which are the rare cattributes (just asked Google to 'learn spelling' this word). At the moment the rarest ones are Royalblue, Wolfgrey, Oldlace, Wingtips, Mainecoon etc.
You can search by these desired cattributes on cryptokitties marketplace.
Add-on tool to see cattributes on crytokitties
This tool is a Chrome extension which shows the kitties' cattributes and their rareness by colour when you hover the mouse over them. Super useful!
And here's my first kitty! I wanted to buy a cryptokitty to check out the transaction process. First I used the lowest gas limit of 21000 and the transaction failed, so I used the suggested gas limit and it costed me nearly $3 in transaction cost where the kitty was only $10 or so. Not great. Maybe I should lower my gas limit next time!
My name is Whixtensions 😺