From what I've been told, in order to stay in a stock class, any wheels used must be to the original spec wheel width and diameter, with an adjustment of plus or minus 5mm of offset allowed. The stock wheel is 14 x 5.5 (don't remember the offset from memory, I think its 45mm), so 14 x 6 might get you booted from the class if you were protested. I believe you can run any size tires that will fit on the stock wheel size, so either of the one's you mentioned should be fine. I now use a 185/60R14 as my normal tire, and others I've heard use the 195/55 with no problems, but anything wider might cause some clearance/rub issues.
You'll have to post as to how the Victroracers feel and perform, I'd be interested to get the scoop. I was gonna try and buy some R-compound tires before the next season starts, but given that I'm a relative newcomer to auto-x, I think for next season I'm gonna get some ultra-high performance summer tires as my race tires. Once I get another couple seasons of experience then maybe I'll step up to the R-compounds. I bought a set of Civic Hybrid wheels (same dimensions and weight approximately as stock Insight wheels) to use for mounting my race tires.
I ran this past season on the OEM tires and finished about mid-pack in HS at all 3 events I attended this year, finished 7th out of 24 that scored points in HS, so I was pretty happy. Hoping for my first podium finish next season (my wife, however, is not, as I've threatened to spray down my back porch with champagne when I acheive my first podium finish!!).