It's been a hot minute since this topic was posted but I thought I would put in my 2 cents anywhoo.
I've been in the industry for over 20 years now and currently I would recommend the following in order of importance (My opinion)
1.) Python (learn 3.x if you have no prior knowledge. 2.6 will just set you back)
2.) Bash scripting (Or whatever flavor shell you prefer. i.e. ZSH, CSH etc.)
3.) Ruby (for more Metasploit pwnage)
4.) Objective language of some sort (i.e. Objective C)
5.) SQL (MS SQL, MySQL, PostgreSQL, MariaDB etc.)
6.) Assembly and/or C for reverse engineering if that's your thing.
I use many more languages and tools but those 6 are my go-to's.