Here is how it went for me. Buying new equipment is, like Kracken stated, a man thing
1960 - Ordered all new Healthways from J.C. Penny including J-Valve tank
1960-1975 Added a few items each year. Another better regulator
1975 - Too much new stuff kept coming out, bought all new equipment and another tank. New type BC, weight integrated and back inflate (AT-PAK)
1975-1995 added a couple more tanks and better regulators.
1995 - Moved so I let my wife talk me into selling most of the gear and rented. Thought renting would be the answer to the ever changing technology
and doing mostly vacation diving now so my bags became a lot lighter.
2005 - Tired of getting worn out rental equipment and did not like the jacket BC's. Missed my old back inflate BC (AT-PAK by Watergill) Started buying gear again, Zeagle Wing.
2007 - Bought new steel tanks 3442 psi, don't like AL80's (course traveling everyone seems to have nothing but AL80's anymore)
So see you just got to have all your own stuff
I have basically replaced my entire diving equipment every 15 years. So it will last for a long time with proper maintenance and care. Even though the inital expense is high in the long run, vers rental equipment charges, I believe I have come out better. And your own gear is always so much better as you picked it out and it is personized. Now I am back to heavy bags on trips, which my wife gives me a hard time about, but it is my own!
Have fun!