If you are happy with the scanning results you get with an Imicus, other ships with scanning rigs will do the job for you. In that case you will sacrifice one hi slot, minimal amount of CPU if you use a core probe launcher instead of expanded one, and rig slots.
At that point you have to make a decision: Do I want safety, hit-and-run approach or less money to sink?
If you choose safety, I would recommend training for an Arazu, because it can equip Covop cloaking device that will enable you to warp cloaked, have an easier time to escape gatecamps and make you harder to track down. Beware though, you will be limited to 40 m3 of drones and 3 turrets with less than mediocre bonus.
If you choose hit-and-run, you have more options depending on your skills. Choose whatever ship that will make you kill NPC's as fast as your skills permit. A drone boat, a blaster boat... anything. But you will be more susceptible to gankers. In this scenario, your priority will be finishing your business fast and gtfo asap. Time is money, so be ready to spend money for your ship, rigs and modules. Sisters Probe Launcher and probes is a must here, as well as T2 modules and non-covop cloak.
The last option is where you can minimize your monetary loss by sticking to cheap T1 ships strong enough to kill NPC ships at the sites, and no more. Although there seem to be an overlap between this option and the previous one, there are nuances. No rigs, no fancy modules because your ship will be expandable and short lived. Be prepared to die often. You may be probed by other players even before you hack the first can at the site, so consider yourself lucky if you successfully loot a site. But on the flip side, you won't lose that much money, and you may develop some PvP skills as an added bonus. Also, in some quiet locations, this method has the potential to work like a charm, even better than others.
As with many situations, there is no best answer, but there is one that works the best for you given the conditions.