I do infrared conversions as part of my job, mostly on Canon and Nikon products.
I have not encountered any Canon PowerShot and Nikon CoolPix cameras that will exhibit hotspots after conversion. I know with full certainty: PowerShot SX100IS, SX110IS, SX120IS, SX130IS, SX150IS, S95, S100, G9, G11, G12. The SX100 - SX150 cameras and G series are quite easy to convert, and I have done them to death. Personally I think the best among the SX130IS is the best model with the best balance between megapixel count and noise performance.
I do know that Panasonic Lumix LX3 will have hotspots even after conversion because I have done one myself. I suspect the same will happen with Lumix LX5 and LX7 because the lenses have similar specifications (the super fast f/2 aperture) and construction. I personally won't risk doing the Lumix LX3, LX5 or LX7.
Sometimes a ghostly white ring can happen in infrared-converted cameras, probably due to the the internal light reflections off certain internal barrel parts of the lens. I have seen it with PowerShot SX20IS though it only happens in very bright sunny day with the sun into the lens.