gold! who do i turn to???

I would like advice please from experienced gold investors ...

I am seriously considering putting money into two gold companies (approx $4 000 each company).

I am looking at the following companies:

OXR, BSG (junior producers)
KCG, SMO (junior explorers)

Q1: Which is the better of each category? (or are their even better options???)
Q2: Or should I look at the BIG gold producers? (eg LHG etc)
Q3: Is this gold rally long-term? (I believe so ...) or am I buying at the top, and setting myself up for a big fall???

Thanks guys ...