So, you are looking for something that is good at combat and significantly faster and more maneuverable than the conda? Depending on your budget and how much faster and more maneuverable you want your ship to be, you have a whole bunch of options.
If you are looking for something really cheap, you can't go wrong with one of the Eagles or the Viper III, especially if you have some engineers and guardian tech unlocked. If you have a bit more cash to spare, the Cobra III, DBS, Viper IV, and Courier are all good picks, and can offer the potential for different tactics (800m/s combat fit Courier comes to mind).
As Pinda Gupta mentioned, the Vulture is also an excellent pick. It is arguably the best small combat ship, and for good reason. Good firepower, good defences, and excellent maneuverability. A good pilot in a vulture can and will kill a mediocre pilot flying any other ship in the game. Power management is an issue, but you shouldn't have any more issues once you have unlocked Marco.
The next big step up in price would be the usual suspects for medium combat ships. Namely, the Federal and Alliance ships as well as the Clipper, Krait, and FDL. Each of these ships offers good firepower along with effective armour or shielding. Each ship has their own advantages and disadvantages:
- The FDS isn't the most maneuverable ship here, makes up for it by having a metric &@!% ton of armour
- The FAS is tied as the most maneuverable ship here, features a good balance of firepower and protection, but has a tendency to drift to a stop
- The FGS is the least maneuverable medium ship, but comes with a fighter bay, good armour and shields, and LOTS of firepower
- The Chieftain is tied as the most maneuverable ship here, features a good balance of firepower and protection, but is a bit on the slow side
- The Challenger is slightly slower and less agile than the Chietain, but has better firepower and protection
- The Crusader is the slowest and least maneuverable of the Alliance ships, but comes with a fighter bay
- The Clipper is the fastest of the bunch, but needs a large pad and the poor hardpoint convergence needs gimbaled weapons to really work
- The Krait comes with a fighter bay, has good firepower, speed and maneuverability, but is a little bit on the fragile side
- The FDL comes with a huge hardpoint and ridiculous shields, but is hampered by poor jump range and an overly small fuel tank
Personally, I would recommend both Vipers, the Vulture and the Krait.