I realize this is probably way too late to answer YOUR question, but for posterity maybe this will help a future question-surfer.
First, I also endorse the Portland road trip, and Union Jack's is great... especially if you are into tattooed girls! Portland strip clubs are just way better than Seattle ones.
But if it absolutely MUST be in Seattle, there are two options not mentioned elsewhere here:
1) Ricks on Lake City has been generally better than the other two strip clubs I've been to in town (including Deja Vu), and hey! The Feds raided them once upon a time for a reason!
2) The really big option nobody here is mentioning is that you can hire a stripper to come to YOU, thereby avoiding all those pesky "laws." She (or they) will do a show for a flat fee, and there's usually some lap-dance type things you can do later for additional money. It's not too expensive if everyone chips in.
One last point of order: Never, EVER under any circumstances go to the Sands. That is all.