In order to get the correct OEM sizes, I changed from the Yokohama AD07's I had used, to Dunlop DZ101's. They are 195/50R16's on the front, and 225/45's on the rear. They are a bit of a compromise - slightly less outright grip than the AD07's (which themselves are a bit less grippy than the stock A048 Yoko's), but should have a bit more life, and slightly better wet grip. I got them at Tire Rack.
When I bought the car, it had the stock A048's, but I knew those were extremely-low-life trackday-type tires, and that wasn't what I do. The dealer swapped them for AD07's, but the fronts were only 175/50's. When it came time to replace the tires, I wanted to use the original OEM-size tires. I've been happy with the Dunlops.
Depending on where you live, one choice to have them mounted would be Matt Olson's place, RRT - www.rrtptm.com/
There are a lot of threads on LotusTalk about performance tires; you might search there.
One other important item - wherever you buy the tires, make sure they aren't old stock. I got two replacement Yoko AD07's from Tire Rack a few years ago, and they lasted about half as long as my first set of rear tires. It turns out, the second set of Yokos was quite old when I got them. You should be able to confirm with Tire Rack (and probably any other mail-order place) what the manufacture date of the tires is that they are sending. It's stamped on the sidewall of every tire made, with week number and year. This is especially important for a car you won't drive that much, since it's really annoying to have tires go bad from age before the tread is worn out. I have replaced tires with decent tread on both my Elise and my Seven. At a certain point, the rubber is no longer usable.
I ordered from TireRack and had them shipped to Fosters Auto Service in North East, MD. First gave the shop a call and had a long talk about the particulars of working on an Elise. Obviously not close to NoVA, but they're a local family-run business and did a phenomenal job handling her with care. Replaced Continental's back to stock AD07's.
I now use them for basic service needs too given how fantastic they've been (and quite reasonably priced).
I run R888's and purchase online; but I've been having them installed at Mr. Tire. I've been to three different ones (depends on where I'm heading that day) and have experienced no issues. Another tire shop actually recommended them to me in that Mr. Tire tends to have the latest and greatest equipment and uses plastic duck bills, which have yet to scratch or chip my powder-coated rims. I should point out that I take the wheels to them separately, already off the car. I'll drop the wheels off either the night before or earlier that morning and pick them up in the evening.