Those new ENVYs too rich for your blood? HP still has some design chops to show off in the ProBook 5310m and the (leaked, pictured) Pavilion dm3. HP is calling the classy 5310m the "world's thinnest full-performance notebook," whatever that means, while the dm3 offers a choice of AMD Neo or Intel Core 2 Duo processors. Both rock 13-inch LCDs, hover around four pounds and measure around an inch thick. The 5310m is available with a Celeron for as low as $699, but to get that "full-performance" Core 2 Duo action, you're looking at a $899 tag. Meanwhile the dm3 starts at $549 for A