Guys invariably always hold fat around their midsection... it's a very stubborn location and the last place you'll lose it... not least because of poor blood flow to that area. It sounds like you've done really well to lose that weight, although without seeing pictures it's obviously impossible to even guesstimate your BF, or how much fat/muscle you've lost. Going forwards though, if you get your training/diet balance correct, and can focus on building more muscle mass, that will certainly help burn more fat and improve your overall appearance, but it's never that straightforward... other factors such as insulin resistance, metabolic rate, leptin levels and plain old genetics will always come in to play.
And you also need to keep in mind, as you're probably already aware, that if you dive head first straight in to a bulk with wild abandon, you'll just end up back where you started. I would hope by now you have a decent idea of where your maintenance calories are though, so go just above that and see how your respond... slow and steady wins the race.
