I'm a big fan of Reaper Miniatures.
They've recently completed a KickStarter to fund building molds for new models. While it's too late to join the KickStarter, it is possible to join as a late backer by visiting their pledge site:
Late Backers can Purchase Here
As a late backer, you can pre-order any items that were unlocked during the Kickstarter campaign at a slightly higher rate. For example, the Core Set is $125 for people that participated in the Kickstarter Campaign, but $150 for people who did not pledge before the campaign ended. I personally think that the models they have are a good value (at least relative to the market), even with the increased cost.