correct english (80-100 pages) text Master Thesis

I am looking for an experienced person who has English as native language, to check 80-100 pages of English text precisely and correct my English. Due date 2 September 2013. Master thesis on strategic management. Should be done in Word review modus. Please correct spelling and grammar errors. Suggest a better wording for ugly phrases. Sample text : Description of the market system starts with defining market boundaries. The method is applicable only when the relevant market is clear. The relevance of the market is defined by considering both the demand and the supply side. The demand side consideration includes all the products fulfilling the same needs and products considered as substitutes by the customers (see Bergen/Peteraf 2002, p. 157 ff.). Day (1979, p. 9 ff.) suggests that it’s not enough to include only the customers the company currently serves. The market conditions are changing rapidly; invention of new products, technology etc. can broaden the range of substitutes and increase the number of competing products, therefore a thorough analyze should include potential markets as well.