A lot of guys will tell you that don't need to change both control arms, I believe it's the top ones that make the difference. If you have the money and want it to look good by having both, a very good product at a competitive price is
www.speedtech-performance.com They have a couple different options available for front set up. You can get just the control arms, lower control arm and coil over shocks or both arms and shocks for just under $1500. The other kit that several guys have talked about and had nothing but good to say is the Hotchkis TVS kit:
http://www.hotchkis.net/6874_nova_tvs_system_small_block.html Comes with front and rear sway bar, leaf springs and coils. You could also do the Gulstrand Mod to the subframe
http://pozziracing.com/first_gen_suspension_geome.htm#Geometry discussion Basically it's drilling two holes to relocate the upper control arm slightly. The article I posted talks about it. You can also read more about suspension on pozzi website, he's got a lot to read on there. If you're looking to get any of the above stuff, I highly recommend you give Frank at
www.gpsuperstore.com a call. He puts all the stuff on his cars and tries it so he knows what he's talking about when he sells it. He's a dealer for Speed Tech and Hotchkis, and most of the other big name suppliers.
If you want to go quit a bit farther, you can check out my build thread. I'm putting in an aftermarket sub, triangulated 4-link etc.
Hope this helps.