i usually have my 'frontline' planets well defended, ie turbo, shield, ion/hyper (depending on SS level) lots of buildings that spawn troops and generally no mines
i start out a match with maybe 2/3 mines on a planet and some in the backwards like alzoc with 5, i then progessively sell these as i get more planets and my income stabilises at about 3/4k a day, sometimes more or less. this allows me to fortify places like byss, geonosis, taris etc. if i have a large level ss, or can build a large ss i usually put space defence batteries, ie ion or hyper as well.
but yeh turbo lasers + shield + cool garrison and ground forces = kick ass fun battle. especially on places where the shield gen is either inside the shield or far away on an island with a tower guarding it