top sorority

Your first step is to actually get into UW.
Next step: go through Greek Preview, which gives you a taste of what Rush will be like with all the talking and house tours.
Next step: go through Rush, where you'll actually get to see EVERY house, get a little taste of each, decide the BEST FIT for you based on the girls you talk to and how natural the conversation feels.

Point is: if you are looking to rush JUST so you can be in a top sorority, then you need to rethink your priorities. I love being a part of the Greek life here, but the key is to respect each house so if you are ONLY looking to get into a house that you think is "top tier", then you need to have a more open mind throughout the whole process.