I currently do this. There is a lot to know.
Just realize this will be very expensive and there are many items you will need to get.
UFC alone has over 7 types of variations. Many of them are highly collectible and cost a lot. The original Boxergenics gloves can be had for around $100. CSCMemoribilia has a few pairs of the first UFC Ouano gloves (red Ouano logo, gold UFC logo) for $200 a pair. Then there are the various Ouano variants used over the years which feature different fonts, and different UFC logos used. Finally are the current Century issued gloves.
Elite XC had at least 4 different ones. The last few were Ouano ones with the different EliteXC logo
StrikeForce has used tons. (many on eBay are fakes)
BoDog fight, at least 3. White, Black, then all white writing or red/black or red/white writing. (Fairtex gloves)
WEC has the original Ouanos, and the last used Century's which are very hard to find.
KOTC has the yellow Ouano gloves and the black Gladiator Challenge gloves.
DREAM gloves are going for $300+ a pair.
IFL had blue IFL logoed Fairtex, red IFL logoed Fairtex, and special logoed Throwdown gloves.
Some you will be very hard pressed to find (Affliction apparently took back the gloves from the fighters after the event).
You mentioned you didn't want "fan" gloves. PRIDE had "white bolt" and "red bolt" gloves:
The red bolt gloves are referred to as "fan" gloves. These were sold at events and on their website. They are a lower quality. Usually meant for fans to have autographed. These came in a ziplock bag inside of a blue gi-material, drawstring bag with the PRIDE logo embroidered on the front. The tags on these gloves will say Ouano. These gloves are not worth as much as the white bolt, usually going for $250-$300 a pair.
The white bolt gloves were the fight gloves. High quality. They come in a clear plastic box. The tags will say Dream Stage Entertainment, and the size. Average selling price now is $500+ a pair for the plain "PRIDE" logoed ones.
PRIDE also used gloves with numerous sponsor logos in place of the PRIDE logo. Some are in English, some are in Japanese, some were printed stickers placed over the PRIDE logo. These are very hard to come by. Last time I seen these, they were going for $800+ a pair.
As for the fakes, BubbaSportz was selling tons of fake PRIDE and StrikeForce gloves on ebay, but he is back with a new name. Some of the give aways, were the printing of the PRIDE logo on the gloves was usually too small, and not in the correct spot. Also, the tags didn't match properly, the quality looked like crap, and a big give away, was the thumb material in the glove. The thumbs of the authentic gloves, should be a blue foam material. All the bootleg PRIDE gloves I've seen so far, just use more thin leather for the thumb pocket.
I need to gather all mine and take a update pic, but here is one from when I first started getting into them.
