(Not a Teacher)
I would ad an "a" before "quantity" to make it sound right. "Sum" would also be a good word to use in place of "quantity". I'd replace "from the side of" with "on the part of". I'd drop "our" from "our science". While "aim" isn't wrong, "goal" or even "dream" sound better.
As for your first suggestions, if "such a lot of money" isn't ungrammatical, then it's very unnatural sounding. However, "that much money" is perfectly fine.
In regards to your second suggestion, I agree completely.
- For Teachers