Are there any rules with respect to how long curtain rods should or should not extend beyond the window trim? i.e. Where should the finials stop? Immediately after the window trim or a bit beyond the trim? Also, can anyone recommend a store that sells nice curtains? I don't have any particular fabric type in mind (maybe linen or silk, depending on the cost); however, I would like something with stripes. Pier 1 has some nice panels but I didn't see anything that stood out. Thanks in advance for any input!