As`long as you realize you will eventually need a larger tank. I myself have used the growout/upgrade method. My smaller silver has been in the following tanks 55g til 9", 75g til 14" 120g, 150g, 85g and was moved into 180g at 17-18". He is now 22-23" and in a 180 gallon and Ive had him since Feb of 2006. The next move will be in a couple months into a 350 gallon tank.
Figure that within a couple years you'll need to find him more suitable living arangements.