So for some reason, I could be wrong, the avios/rewards approach is horrible on BA after their recent updates on their website. For instance for dub -> LHR -> LAS/IAH/SEA do not have the domestic flights match up in terms of the times i.e your international flight leaves before your domestic flight arrives.

anyway.... I am planning on leaving on the 27th or 28th Feb (next week - weekend preferred) for around 2 weeks (until the 13th march)

SEA seems to be sold out and connection changes only if booking cash and the connections are long and hard.

IAH is fine for me too but going direct to SEA would be ideal.
from Dublin, I am getting around £2200-2400 for business (both sides). sure, its reasonable but a little too much for me at the moment.