I have 25mm Dixon ACW. I figure them to be about the most expensive 25s at $1.49 US for an average figure and 20¢ more if he's got a standard, drum, bugle, or looks like he's shouting orders to someone. Dixon are a little "trollish". The proportions aren't always right (i.e., big heads, short legs) but they're mighty fine figures in my book. They also have a huge variety of poses so your units can look very fluid and busy, not like they're all striking a pose. Dixon also has a wide variety within each pose with different heads/hats and accoutrements. Take a look at their line at: http://www.spiritgames.co.uk/dixonacw.html. Note: The Dixon artillery is too small. I use Connoisseur guns instead. They're the best I've seen.

Another ACW line that's very nice is Redoubt. These are definitely 28s and match Foundry in design and size. Redoubt lines can be hit or miss. This one is a hit. The figures I've seen are beautiful. Like Dixon, they have a lot of variations in pose and equipment. The figures are all "Marie Antoinette" style, i.e., the heads are separate from the bodies. The head variants are legion. There are several different styles of hat and you can order the ones you want. This makes it possible to do combos like troops wearing frockcoats and havelocks for early war units. Redoubt also seems to be going head to head with Dixon on having a never-ending line. One advantage is that they're about 4¢ cheaper per figure than Dixon.

For Napoleonics Foundry are the best I've seen. The French range is especially broad with a good deal of variety. They do French 1809-1815, British, Austrian 1805-1815, Prussian 1813-15, and Bavarian. Front Rank are also nice figures. Not as many poses as Foundry, but they also include Spanish and Portuguese if you're interested in the Peninsula.