The Canon SD450 has better image quality. Its 7mp sibbling SD500/550 has a stronger flash that the T7, I do not know if the SD400/450 one is comparable but you should be able to find the flash strength on Canon's site.
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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
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