All those exploits are gone now anyway, patched, you can't replay those missions anymore.
The Elegy you can order from the Legendary Motorsports website.
The pricing is kinda fucked up online. I bought a 6-car garage for $62000 in the boonies, but it cost me $10000 to buy an SMG, and another $9000 to buy the extended magazine for it. Retarded. It's like a pricing conspiracy by R* to sell the money packs.
Aside from that, I'm pretty well sold on the GTA:O experience. The co-op missions are fun as hell with the right people (with mics). Late last night I kept getting invites from a high-level dude to do some really hard missions and it was a blast. We had a 6-player co-op mission last night that had us assaulting the Sandy Shores airfield, stealing planes and choppers, and those of us in the choppers had to defend the airplanes from Fed choppers, culminating with those airplanes having to land in a really tight spot at the docks.
The races are pretty damn fun too. It kinda brought back that Need For Speed rush from back in the day. Just accept the fact that there will be douches that won't play fair and you can have a blast with it. I've found that as long as I can avoid the Turn 1 carnage I have a pretty good chance of placing in the Top 3.
Oh, there's a $500,000 stimulus package coming from R* over the next couple of weeks to make up for all the troubles with GTAO.