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Oh I missed the stock rims. That's a bit tough for summer tires. The closest you'll find for the Star Spec is 195/55/15 which is a little shorter than stock at 23.4". Stock is 24.2". If you want the slightly wider 205 you'll be looking at 205/50/15 which is shorter still at 23.0". But, you you're not worried about money try to find some 16s on craigslist and then get like a 225/50/16.
In My Opinion:
195 60 15 or 205 55 15 for street use. 50 series side walls look goofy on our rims and won't ride as "comfy" as the 60 series. I'd only roll on the 50 series sidewalls only if I had 16s. I'm sure the widest you can put on our stock rims are either 225s or 215s + with smaller sidewalls. 225 50 15s or 215 50 15s...but such a size is pretty odd if I remember correctly. If you're spending money on good all season tires, get michelins. I'm planning to get a set of snow and summer tires so I will probably invest on tires that won't 'burn' out so fast during the summer. The Dunlop Star Specs are nice.
A 70 series sidewall is going to be really spongy and not much fun to drive. I'd stick with the 60 series or less. Plus, if the tire is to large in diameter it'll but the front fender liner. Ask me how I know...