Since you want to keep it low tech, I agree, don't over do it on ferts.
While dry ferts are certainly the cheapest option, it can get a bit more complicated when it comes to dosing. There are dosing strategies out there with more precise recommendations (i.e. EI, PMDD, etc.), but the reality is that they aren't guaranteed to be 100% absolute methods for any and every tank...a lot of people end up tweaking things to suit their needs.
A more simple (but more expensive, especially on a larger tank) approach that has worked relatively well for me in the past on low tech tanks is using the Flourish line, which are some of the commercially available liquid ferts. I started out simply dosing Excel (C source) and Flourish Comprehensive (mostly micronutrients, but has some NPK as well) before deciding to target dose everything separately. Then I ventured into dry fert dosing and am using a sort of modified EI dosing schedule for my slower growth tank...although at times I've sort of been winging it...
Not suggesting that you should necessarily goes this same route, especially considering that you have more volume to work with...but in the end, there's no one way to go about fertilization...it's a confusing (and frustrating) component of the planted aquarium world. You'll find almost as many opinions on this subject as there are tanks, because none are alike. For that reason alone I suggest starting slowly and doing a bit of experimenting on your own to see what works.
