I used to have a guideline: 300 size reel for 6" baits, 400 size reel for 8" or larger baits. All but one of my reels are with DVT now, and for the last two outings, I threw small baits (hardgills and slammers) on my Calcutta 401TE instead of the usual Curado 301E. Surprisingly, on the same rod, the Calcutta 401TE seems to cast slightly better than the Curado 301E. I also have two Cardiffs (401As); both have gone for servicing. But from what I recall, the Calcutta does *not* cast significantly better than the Cardiffs. Other than the casting part, the Calcutta is of course the smoothest, followed by the Curado. I still like the Cardiffs though. Keep in mind the Cardiff 401A is significantly wider than the Calcutta 401TE; if you like to palm your reels. I retrieve with my non-reeling hand on the foregrip, so it's not an issue for me. I recently bought a Daiwa Luna 253L (same capacity as Shimano 300 size), but it hasn't got here yet. We'll see how it performs.
I do not have any experience with Calcuttas or Cardiffs under the 400 size, but if you go onto the Shimano website, you can find data on the retrieve rates (IPT) of the reels. The Curado 301E is way too fast for swimbaiting- I don't know about money minnows though. The Revo Toro Winch in the 51 size, and the Daiwa Luna in the 253 are both slower than the Cardiff 301A. There's no Calcutta 301TE, but there is a Conquest 301TE.
I have more than a few swimbait setups; from the cheapest decent one (Okuma/ Cardiff) to a pretty high-priced one (GGR/ Calcutta). I like them all. Sure, the feel with the Okuma is not as crisp as that with the GGR, but I can live with that.
As far as rods, I don't have problems feeling bites with the Okuma slow-rolling 8" hudds in 30 feet of water with mono. But who knows how many bites I didn't detect? I always liked parabolic rods (Okuma/ Mattlures) for big baits. I talked with Greg (Ross), Mike (Gilbert), Steve (P) and a few others before I decided on the GGR, which has a fast taper. Seems to working out fine too.