Cozy and inviting.
Whatever you shop for, if it can't be described by those two words, don't buy it. Most of all, make sure your bed looks very cozy, the type of bed she'll look at and all most want to dive on it just from seeing. Buy the nicest bed you can afford. Get a high quality mattress or some nice memory foam pads to put on top the mattress. Get a soft thick comforter, not a solid color but something decorative, high quality sheets, have big fluffy pillows that your head just sinks into, as well as other decorative pillows that look nice to lay on.
I would buy a lamp that has dimmer knob rather than on/off switch so that way you can set the mood lighting to exactly what you want.
Have some kind of sound system with an ipod dock. Doesn't need to be anything fancy, but should be in reach of the bed, or have a remote so you can create some mood music.