you don't go long on something just because it has fallen a lot. You have to remember, the fed has reduced rates as far is it can (to a range of 0 and 0.25%), the ECB has been slow to cut and so they are likely to cut rates to fight the deflationary and recessionary environment. You have Q3 eurozone gdp this thursday and that is likely to b pretty bad. However, you do have non farm payrolls in the U.S on fri so that cud hurt the dollar, but to be honest, the numbers are unlikely to be as bad as last time (-533,000), so dollar could in fact strengthen on the news. If you wana trade anything, I reckon it would be short GBP/USD