Do I need a bigger PSU?

Alright, I blew my Enermax 485w a bit ago after 6 months of using it, and I replaced it recently with an Antec TruePower II TrueControl 2.0 550w. Well, I just returned that one too after a few days since it had a defect in it, and wouldn't hold steady +12V power (fluctuated erratically), and I now have an Enermax 535w in there.

Is a 535w good enough for my system's specs? I will replacing the Ti4200 with a 6600GT (AGP 4x/8x) in a few weeks as well.

-Intel P4 2.0ghz
-Enermax 535w PSU
-Gigabyte GA-8IEX rev 2.0 mobo
-6 HDD's (all Ultra ATA 133), 2 hooked up to mobo (both 80GB), and the other 4 (ranging between 160 and 300 gb) hooked up to a Promise Ultra 133 TX2 controller card
-Nvidia geforce4 ti4200 (will be replaced by 6600GT soon)
-1 gig ram (2 sticks of 512MB PC2100, mobo won't support better)
-Netgear Wireless card
-USB 2.0
-4 case fans
-DVD R/RW
-CD R/RW
-floppy drive
-crappy soundblaster live 5.1 card

I know its not AMD as well... im sorry...

Im just a bit paranoid when it comes to PSUs now. I checked on http://www.jscustompcs.com/power_supply/ and it seems like im good, but even my 485w should have been fine and that blew.

just buy a wattmeter(no not a multimeter) and check how mutch you consume, you will be suprised. (my system is probably more power consuming than yours, and when i check, i get an average of 220W)
Anyway, i dont think your last PSU blew becuse of overload, more likely is that it blew becuse of 1.Power fluctuation on your power grid or 2. A Malfuntion.

A good thing to check is if you are overloading one of your PSU outlets (like adding more fans, which generaly only draws power from the 12v+ so by adding enught fans will cause the 12v+ part of the PSU to be overloaded, but without reaching the max W of the whole PSU).
Hope that helps