Good left handed ibanez guitars are the RG3120, RG550, RG570 (no longer in production) and the RG1570 (replacement of RG570, in production). As far as 7 string guitars go there aren't any (well there was the RG7420 but it had a lo trs trem). Ibanez has a few left handed endorsees so there are a few custom left handed ibanez guitars lurking around. I have a lefty RG1077XL which I bought of an endorsee last year.
Left-handed Ibanez's I have played are a Jem Jr 555, RG-470, AX70 and a late 80's RG-550.
Late 80's 550 is BY FAR the best guitar I have ever played! Suprisingly the cheapo AX70 was the next easiest to play.