Strategy probably depends on the days to days using of the photography
On my side I'm a kind of drug addict to Fast lenses (depth of field and low light capabilities). Yes I know that for the low light I'm probably not on the good brand ... but I have always chooses Minolta over other for the size of the lenses vs performance , and also to make all my prime stabilized.
So for my strategy is to have a prime for every use. From Wide to zoom ...
When I go traveling in plane, I'm able to put in a very tiny bag (about 17x12x15cm) : A900, 16mm 2.8, 28mm 2.0, 50mm 1.4 and 100mm 2.0. Usually with that setup I'm able to cover 95% of the shot I need. Tiny flash + 55mm polarized (all lenses are on the same size) + 2 batteries and some extra memory cards. This is almost the same setup for Shooting in a small Montreal Bar at night for rock concert, where I removed the polarized filter and some time swap the 50mm 1.4 for the 50mm 1.2 MD (impressive lens) and also the 58mm 1.2 MD (less sharp but magic effect).
If I'm going in a larger place for concert, usually I will transform my setup has :14mm 2.8 (Tamron) 20mm 2.8, 35mm 2.0, 85mm 1.4, and 200mm 2.8 + 1.4x converter. Big flash.
For insect hunting : 200mm 4.0 Macro + 50mm 2.8 Macro + 1.4x converter.
For Bird hunting : Tamron Adaptall 60B 300mm 2.8 + 200F adapter + M42 confirm focus.
For great day will good sun, in forest I'm always putting the 50-500mm Sigma Bigma.
For social activities where I want to relaxe and give the camera to other people to take picture : Minolta 28-75D 2.8 + Big flash or small flash.
When I was APS with the A700, the best package for traveling for me was the 18-200mm minolta + 67mm polarized filter + 50mm 1.4 all in a small Camera bag,
I have a 500mm Reflex. Any interest

I have found that it is better to bring the bigma that this lens on the A900.
Regards,
Frank