Importing video onto Premiere cs4

hi,
I have the Canon Xh-A1 and I'm shooting in 1080i/480i , frame rate 24F, and signal is HD.. My question is which settings should I use to have the best quality in adobe premiere pro cs4? The options are a bit confusing when you start a new project. So when I do open a new project I use HDV capture format. Then when I get to a new sequence I choose under the HDV options 1080i25 (50i). That seems like the closest? The other options are 1080i30 (60i) Then there are 3 1080ps, ( I figure I shouldn't use those because I'm shooting in 1080i, and the rest are 720p24, 720p25 , 720p30. So which format should I be editing in? and also the same thing with exporting. Should I export in 1080i or 1080p? or should I use something completely different to import the video on?
Any input would be appreciated!

Thanks,
Corey