I have gotten a lot of mileage out of a book I have on statistics for engineers. There's lots of choices in this area so I'd look on Amazon and by a used book.
Another book I'd recommend, since you are going to need it on your bookshelf anyway, is David Ruppert's book "Statistics and Data Analysis for Financial Engineering". When I first used Ruppert I didn't like him much. Some of his explanations can be sparse and his notation can be confusing. However, he has grown on me, perhaps as my background has improved.
When you are registered as a UW student you have access to the on-line library resources. This includes Springer-Link. You should be able to order a paperback version of Ruppert via Springer-Link for $25.
Another classic, which you should be able to get used is MASS: Modern Applied Statistics with S+. R is based on S+ and most of the S+ functions exist in R so this is still a great reference. David Ripley, the co-author of the book, is active on the R forums. A lot of us wish that he would write a new book that directly references R.
I like Julian Faraway's book "Linear Models with R".
And, since you will be using R, I recommend Norman Matloff's book "The Art of R Programming" and "R in a Nutshell". I've also gotten a lot of use form "R Graphics" by Paul Murrell. This is a basic book on R graphics that explains things like the plot margins and various ways to control plot labels.