I've researched this for you .. and I'm thinking the Streamlined boom is the one .. and the prices and availability are good too .. Enjoy your summer.
If you are ok with the Simmer curve and stiffness is a priority, then the extra half-kilo of carbon in the NP XC Wave is also worth considering.
If you are ok waiting until next season, then the DuoTone is worth considering (I'm guessing that you won't find stock).
New School CurveDuoTone Platinum Aero 140-190 .. 1.95kg .. 27.5mm with grip
DuoTone Platinum 140-190 .. 2.20kg .. 27.5mm with grip
DuoTone Platinum MegaSlim 140-180 .. 2.05kg .. 24.0mm ? (assume with grip like others)
Streamlined Angulo HMX 140-190 .. 2.1kg .. 27.0mm with grip
Goya Super Skinny Pro 140-190 .. 2.12kg .. 24.5mm (I think excluding grip).
AL360 E3 Carbon 140-200 .. ? .. 28.0mm ?
AL360 Carbon Slim 140-190 .. 2.1kg .. 25.0mm ?
Old School CurveNeil Pryde XC Wave 140-190 .. 2.60kg .. 27.0mm with grip
Simmer SX10 140-200 .. 2.3kg .. 25mm ?
Simmer SX8 140-190 .. 2.4kg .. 25mm ?
GA Slim Carbon Pro 140-190 .. 2.2kg .. 24.5mm ?
Chinook RDG Carbon 135-185 .. 2.0kg .. 24.5mm ?
Very Old School CurveSeverne Enigma 140-190 .. 2.0kg .. 25mm with grip
Maui Sails 140-200 .. 2.20kg .. 30.0mm with grip
Hot Sails Maui 140-190 .. 2.15kg .. 28mm ?
Chinook Pro 1 Carbon 135-185 .. 2.0kg .. 28mm
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For your convenience ...
http://www.streamlined.us/2017-angulo-hmx-140-190cm/www.surfsailaustralia.com.au/product/streamlined-hmx-carbon-wave-boom#surf-sail-clothing-hardware