I would say that getting even a sampler or even a 3cc bottle is pretty small. My Lubicle Speedy that I got last Christmas is starting to run out because I use it often.
I would recommend weight 5 or some other lube that slows your cube down and then some fast lube such as stardust or lunar (SCS) or DNM-37 (TC)
With that if you get a 5cc Syringe of Weight 5 (You Don't need too much it will last) and probably a 10cc bottle of some speed lube. These can be something like Lunar or stardust in SCS. You could also buy a bottle of Fz-Calm (3cc) but I think that it is fine if you get those two that I mentioned before. Fz-Calm has a nice plush feeling to it.
Just make sure that when you lube your cube, you don't lube it super often. Make sure it's just once in a while (once a month or something like that) but not all the time.