I operate a consultancy based in Australia, with an office in Israel. We are experts in IBM technology and have built a web data mining application that can handle more than 90% of current web formats. It is extremely fast, flexible, can run on a range of platforms (we prefer Linux or Windows). It is capable of immense scaling, runs in multiple streams in the background, builds an advanced database from mining results to facilitate follow-up for updates/changes, eliminating duplicates etc.
If you are looking for quality, reliability and flexibility, don't go searching in the east - you will be sorry (I speak from experience).
Let us have a sample target site and we will return a comprehensive result within one day!