I'd look at the Givi Trekker Lite 35 or WL 901 - the V40 is rather a blob. Aluminium cases like the Dolomiti are very expensive and might look out of place on an RS.
I really like my V49 Air because the lock has an intermediate position where the case is locked to the bike but the lid can be opened without the key. Probably rather too large for your modest needs.
If you PM me, I may be able to take pictures of them tomorrow if the shop has them on display. I won't ask him to unpack stuff specially just to take pics - unless you are 99% sure what you want and wish to purchase from Alchemy Parts in N. London. Owner is a good bloke and worth supporting.
Best wishes,
John