sinks do not NEED to be centered under windows,,in fact if the light/view and ambience in the space comes from the window, playing that stretch up differently can benefit the space.however, one understands the traditional vibe you are thinking of-sink under window/okay...so the other thought is a corner sink because in small kitchens where you are trying to maximize counter runs sometimes that deep corner is very well utilized with a sink which frees other runs.it just depends.....Assume you want to proceed with sink under window....have you nailed down the size of cabinet: 27 in cab will provide an ample sink for a small kitchen....30 Inch?....your sink faucet/and placement of trash[under sink?] should be nailed down..and then see what's left. so presume 27 in sink base..21 in left over...do you want pull out trash-that's 15 in with 6in for rollout pantry.....but do you need a buffer filler so doors don't bang on perpendicular runs.....Best is to post even a basic sketch with some feet...show where door/window are and where you want fridge/range[has that been figured out?]....small kitchens can work well....don't assume anything about placement until you look at the whole.

Thanks for your response. I'm attempting to upload a photo of the dimensions and current locations of refrigerator, range, and sink. We don't want to do a lot of moving stuff around for cost reasons. Though it is a small kitchen, we do have a large-ish family (4 kids) and have guests for dinner on a regular basis, as well as hosting large extended family get togethers several times a year (Christmas, Easter, etc). So I definitely want a sink that is larger than what we have, and I think we'll need at least a 30" sink cabinet, if not bigger.