Best way to analyze keyword difficulty for 10,000+ keywords?

[nicole.healthline]

I've done quite a bit of searching, but can't seem to find a time efficient way to accurately analyze keyword difficulty for large sets of keywords.

All of the keyword difficulty tools out there that I've tried are either 1) not accurate 2) slow (like seomoz's kw difficulty tool only allows 5 entries at a time).

Can anyone recommend any shortcuts / tools / processes to analyze kw difficulty for large sets of keywords?

[StreamlineMetrics]

I would also love to find an accurate way to instantly measure competition for a bulk list of keywords. Unfortunately, I think it's the inherent nature of this request that the tool is either going to be quick and inaccurate/outdated OR accurate and slow because keyword difficulty is determined by organic competition which requires querying a search engine's organic listings for each keyword to grab a list of URLs, then analyzing the on-page factors, then analyzing inbound links for each of those URLs, and then comparing all of these against each other to determine how competitive each phrase is.

And considering most users want to find out difficult a keyword is to rank for in Google then that means most tools will need to query Google's rankings/API in real-time for every single keyword to get the most accurate results, but that also means this process is going to take some time, especially since Google actively tries to prevent tools from automatically grabbing/scraping their results (as Raven, WordStream and SEOmoz all found out just recently).

Anyways, I realize I'm not answering your question so I want to offer some suggestions, even if they are not exactly perfect -

1. Long Tail Pro - My favorite keyword research tool as of late, and they actually just released a new feature which allows you to import keyword lists up to 10,000 of your own keywords to check competition. However, since it queries Google, it's not going to be instant... however it does seem to be more robust and faster than my next suggestion.

2. Market Samurai - great for keyword research/competitive analysis but it can be somewhat slow. Their newest update features more competition metrics which look pretty useful.