I use my SB800 flashes ( i have 5 of them ) because of the portability , but yes they do have limits.
For indoor stuff take a look at
Alien Bees Einstein
the bee 800's would be nice too.
Check this out
Foundations of Lighting Placement
here's a three light set 42" white shoot through umbrellas left and right 24x24 soft box center
same setup plus one more for top lighting and one rear fill
how many lights did i use here ??