You really need to consider also, that in 3 months when you're ready to buy some of these wonders you'll have enough infra/tech for others as well. With that aside, DRA and the NRL are two good ones to start with but with the way the updates have affected things I'd alternate econ. wonder/military wonder every month for a healthy balance.
Personally my order for your nation would be:
DRA
FAFB
NRL
PENTAGON
[econ. wonder]
WRC
but in 6 months you'll be bigger and other wonders will be come available to you.