If you mean that at all - you should strongly reconsider your thoughts on starting a business as you may not have what it takes to handle the endless annoyances, red-tape, disappointments and let-downs one faces in business
However, of your choices - 2 D300s and a good range of fast glass, 20gb flashcards at least, 2 SB-800s, flashmeter, £2,000 of samples/stock to show potential clients should be a MUST starting place for anyone - then fast computer, CS3, big monitor, external HDs, office desks, cabinets, business name, business plan, friendly bank and to stand a reasonable chance - lots of talent helps
Still wanna do it?
Good luck then
DD