After doing the research I went with the A300 and I love it. 350 has more mp on the same sensor making the images more grainy. aside from that because of the larger mp on the same sensor your continuous shooting is slightly slower.. 2.5sps vs 3 sps... not much of a difference but i notice it.. my step brother has the 350.. other than that they are identical.. and unless your going to be printing larger pictures the 300 is better..
Joe
Edit: My set up consist of..
Sony Alpha 300 (10.2mp), Sony 18mm-70mm(f3.5-5.6), Minolta 50mm(f1.7), Sony 55mm-200mm(f4-5.6), Sony 75mm-300mm(f4.5-5.6), Kenko Extension Tubes 12mm 20mm & 36mm, Sony HVL-F36AM (external flash), and a Targus 66" Tripod which does me justice