Given your criteria (which is to say, no more than 'something you can use left-handed') just about anything the service-grade manufacturers make will suffice. There are still some guns made with single-side safeties, but not many. The A-100 is a variation of the A-80, which is a knock-off of a Sig 220. (According to wiki; I admit I peeked.) Since you're familiar (if not comfortable) with using your shooting hand to operate the magazine release (and possibly the decocker and slide stop) then you've got a wide selection to choose from.
Since you didn't indicate that you would be competing (where the ambi slide and mag releases are more critical) your choices aren't really that much more restricted than what rightys have.
If you have a desire to compete in action pistol, or just want something that's fully ambidextrous (including slide and mag releases) then off the top of my head there's:
The aforementioned HK P30/P2000s and HK45s,
The STI GP6,
The CZ-85,
The S&W M&P,
The Bersa Thunder9 (and the Walther P88 it's based on, if you can find one),
The FN FNP (.45 only I think; the 9/40/357 doesn't have ambi slide stop),
The Sig P250s,
The new Taurus 800 series
Off the top of my head, that's all I can think of. Lots of other pistols have reversible or ambi magazine release buttons (Beretta 92s, Sig P-serires) but there's not very many truly ambi pistols (i.e. all controls are left-handed, including the slide stop).