Great score! " Wardrobe Essentials" that will be a great backbone. Exactly what I was aiming to express about, if you are wearing conservative items, try to find ones that make you feel slightly luxurious when you wear them. But not to break the bank, so, even at lower price points ( such as sales on BR, AT ) some items will turn up that a store just happens to do very well, maybe better than their usual quality.
I think you are smart to put office culture above personal style. So many times one will get advice, "oh, you must be true to your own style" but is very easy to be much more "me- fashion " oriented than career- oriented and can be naive about office cultures.
Do you read Corporette? It's way more business- formal oriented than what your office sounds like, but does discuss dressing to fit in, and is fun for another viewpoint to balance the very casual blogs, and also features clothing items that are more conservative but are versatile enough to fit into business casual and can be dressed down or up for occasion.