A 250 GB hard drive fills up *real* fast after you throw in the OS, several versions of Maya (you need to test new releases before adopting them!), plus other software, etc. Get a cheap secondary terabyte-sized platter drive for data and miscellaneous storage. Power supply might be a bit light, especially if you are going to update or add more hardware later.
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.