Ok, to sumarise the position we seem to be at:-
I think (hope) we agree that the A/c should generally fall in line with other bombers in terms of general stats and cost. Formations of two fit the bill as well.
Shmitty is now looking for only two variants, where the AT variant has good TK capabilities. Hena still prefers a DC2 singlton variant, and wants to keep ranges reduced (quite right too

) though I think we all agree that Bombers ought to have some
limited capability at 45cm. Finally both express some concern over the up-gunned TK railgun and want to keep weapon stats consistent across the Tau models.
For my part, I would generally agree with the sentiments expressed above though with some reservations as we appear to be regressing a little.
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Ok, can we revisit the rough design process here.
1) Gain consensus on the number and type of units per formation.
2a) Agree the role(s) and general stats of each formation
2b) Derive a cost for the formation(s)
2c) Fit the 'fluff' as far as possible
3) Refine any further restrictions and the datafax(s)
In parallel with this, it may just be worth a quick review of weapons stats, though again I must point out that of necessity the stats of airborne weaponry will probably vary from their ground equivalents.