Who supplies the lowest profile roof rack for the current RRS (compatible with the OEM Land Rover roof rails)? Land Rover's own seems bulky and out-dated somehow. 2013 RRS TDV6 HSE, fuji/almond - First in Finland to order the new model
2007 Freelander i6 HSE, stornoway/black - First in Finland to order the new model

Unfortunately having been through this myself you are very limited for choice on a Range Rover Sport.

Baja racks make one and so do a company called Voyager racks. Both are based in America other than that a Thule Canyon Roof Basket with a Thule extension on Land Rover roof bars.

I used the Thule set up for a while before I found a Genuine G4 roof rack  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

Buckster is collecting all the G4 Sport bits  Visitor from fullfatrr.com
* GONE. 2012 RR Sport HSE SDV6 Orkney Grey. Now being piloted by RRSTDV8
* GONE: 2011 4.4 TDV8 Full Fat. Amazing piece of kit.
* Current. 1974 Lightweight 2.25L petrol. Old skool
* GONE. Freelander GS TD4 Manual MY2013. Orkney Grey with privacy, cold and clearview packs, armrests (a must!) and a spoiler.
* GONE. Range Rover Classic '93 200Tdi Factory fit
* 1949 80" in family since 1975