Yes its up to you as to what you want to spend your money on now.
Me, like I said have had mine at 3 inches or above for 70,000 plus miles, not one problem, I am anal and under mine at least every 2000/3000 miles checking everything, spraying, lubing, greasing etc.
If I was you I would install the lift ( as it comes from AllJs) and enjoy it for several thousand miles and if at some point the CVs need replacing then do it then !