can not cope with a tent lower than 1m ... good strong roomy 3-4 season tent under 3kg
sounds like my sort of mission ... perpetually on the lookout for the perfect tent ...

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my specs include 4 seasons capable, 107 cm headroom inside at a spot where I can comfortably sit, inner tent set back so that you can leave the vestibule open even if it is drizzling, min weight, etc. etc. etc. ... I like to meditate in the tent while gazing out ...
don't know much about the MSR, but wouldn't consider it for 4 seasons use for meself in Tas, the inner tent is mostly mesh, that wouldn't be warm enough for me.
I've got a Hilleberg Nallo 3 for solo walking in 4 seasons terrain (~105cm headroom at the entrance, 2.3 kg, not retailed in Oz, easy to buy from hilleberg.com in US).
The Wilderness Equipment 1st Arrow Sil would come close to your requirements too, but it is 3.2-3.3 kg (currently avavailable for $499 on special in Hobart, see my posting in the gear forum).
I'd be interested in hearing what you end up with.

a.