A more suitable camera for your use is the Z1. It has a 5mp sensor,and has the same higher ISO capabilities (upto ISO 800 in this case) with less noise than other cameras of its class, it is much more compact and you may find it to be more stylish. It does take better photos than other cameras with its form factor, the T9 from Sony being the exception (same quality according to me) But the Sony has more noise, so it is less suitable for your use.
Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30