If you're not too tall, then the best & cheapest option is to buy the regular 1150GS & then retro-fit the Adventure tank.
This combines the twin seat set-up of the GS & the increased fuel range of the Adventure. Drilling a 6mm hole about 1/3 of the way down the filler neck increases capacity by another 2 litres.
Buy a used Adventure tank shell & fit your existing GS cap, filler neck & internals to reduce costs. Bending a slight radius in to the float arm will delay the low fuel warning light coming on - did this to mine, 32 litre capacity & light comes on with 4.5 to 4.75 litres left.
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