You haven't stated whether you're using a dual-cell mod or a single. If dual, avoid the chargers that won't charge at full speed with more than a single cell. This may necessitate buying a 4-bay charger.
Reference:
2 cells at 0.5A: four hours
2 cells at 1.0A: two hours
2 cells at 2.0A: one hour
2 cells at 3.0A: 45 minutes
Although a slower charge is better for longevity you'll probably find the convenience outweighs the savings, especially since it's unwise to leave the charging cells unattended. For me, 2.0A is the sweet spot.
Be sure your charger has a traditional A/C wall adapter. You don't want anything that uses USB or USB dongles as power connectors.
Also bear in mind that while you probably use 18650s (6.5cm long) now, you may some day upgrade to 20/21700s (7cm long), and may want to ensure that your charger can accommodate them.
Companies known for manufacturing quality chargers are: MiBoxer, Nitecore, and Xtar. It's important to buy quality, since cheap chargers can overcharge your cells and be dangerous.
I use the
Nitecore SC4.