Calgar is odd.. nobody fields him in less than 2000 points, so since your trying to swap less..I'd sell him as a one off separate and then sell the rest as an army with a homemade
HQ of awesome conversation.. (or just waste him and throw him into the rabble)
You need a sergeant with power weapon and storm bolter *per squad* of (shooty)termies, so if you only have one then you only have one squad of 10.Unless mentioned otherwise I'll assume that there are no special weapons (assualt cannons, cyclone missile launchers chainfists)
=1x10termies squad
UM tactical squads can be bought in 5s, but really are only ever bought in 10s because that unlocks the free flamer and missile launcher (and allows you to take any weapon whatsoever beyond the sarge taking a combi weapon...also its easy for you to work out..so without you knowing how many special weapons, plas, melta, missile flamer lascanon etc)
its best to speak in terms of
2x10 tactical marine squads.. (which would be the same points if he had 2 flamers and 2 missile launchers due to the wierd way the points work)
so
1x 10 termies
2x10 tacticals (inc 1 rhino)
6 scouts (free normal swap weapons)+ 1 Heavy bolter
=873 points
+250 for calgar.
Hope ill person has best outcome soon..