Is that the 30" wide tank that is taller than the typical 29g (my first tank)? If so, then it is quite high.
When you state you're going with PCs (which are great by the way), my mind jumps to high tech. You then state no CO2 and low-light plants. So, my mind is a bit unsure of your strategy. Good low light plants would be the Anubias family, Java ferns and Java mosses. Lots of folks have done very creative designs with these plants.
I'd also highly recommend taking a read through rexgrigg.com. He's got a nice, no-nonsense overview of planted tanks and what all is required.
Keep those questions comin'!
46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member