Feedback on this 100 gal set-up costs?

I've been racing R/C cars and flying R/C airplanes for about 8 years now, and this is hobby isn't that bad when it comes to cost compared to toy cars and planes. Keeping up with R/C car and plane tech is outragous $$$. At lease when you drop a bunch of cash on a reef, you don't have to spend too much keeping up on it, unless you get addicted and keep going bigger which pretty much everyone does...

 

I've scaled to a 75 and i"m happy with the budget. I did see a 125 for sale two days ago locally but I'm not ready to start purchasing just yet. Thanks for all the input. Based on my list I don't feel I've cut corners at all and based them on these forums and others with top equipment. I'll post my revised list for additional feedback.