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We study a bound system of N identical bosons interacting by model pairpotentials of the form V(r) = A sgn(p)r^p + B/r^2, A > 0, B >= 0. By using avariational trial function and the `equivalent 2-body method', we find explicitupper and lower bound formulas for the N-particle ground-state energy inarbitrary spatial dimensions d > 2 for the two cases p = 2 and p = -1. It isdemonstrated that the upper bound can be systematically improved with the aidof a special large-N limit in collective field theory

General energy bounds for systems of bosons with soft cores