It might have 57' classics in it now since its a reissue of an older year or it might have 500T gibsons ceramic bar pickups. V's normally have the 500 T. Burstbuckers 2 or 3 would work good for it. Also I think the dirty Finger sounds good too if your going to play fat chords with a good healthy chunk of distortion. Gibson is about 135 pickup.
WCR pickups sound fantastic as do Lindy Fralins. But those guys are expensive. Around 150 to 200 a pickup.
Seymour Duncans antiquities sound great but their expensive as well. Other seymours that are cheaper sound good too but I think their more modern pickups sound better then their vintage pickups in this line. look to spend 75 to 100 a pickup 150 for antiquities.
Dimarzio sound good and offer a lot of paf pickups. their 35th anniversery sounds killer. 75 to 100 here too.
then their is the chance takers. GFS. These are really cheap pickups but have a lot of tone for the money. I use them in my favorite stratocaster and they kill. I had tried tons of crap seymour duncan pickups and even custom shop fender and just couldn't find a sound that I liked. I was putting a parts o caster together and bought gfs for the fact I was on a budget. when I put them in this cheap guitar I was shocked! These pickups sounded more Fender then anything I had tried thus far and that second pulled them out of that guitar and put them in my holyest of grail guitar Lucky the stratocaster. Everyone who heard that guitar before agree's thats the best it ever sounded.
I've bought Tele pickups and had good success, I bought little killer pickups for strats and had great success, I've bought a vintage 59' Humbucker and put it in another strat and wouldn't you know it, it sounds awesome. I paid $35 for the humbucker. 65 for a set for the strat, 75 for the set for another strat, 90 for the set of tele pickups. I love them.
Now I also would like to say if you are not happy with your current humbucker you should try changing your tone cap first. this is the worlds cheapest mod. like .50 cent for a capasitor at radio shack??? You currently have more then likely a .022uF cap in your guitar. If that is too bright you can go up in resistance to a .033, or a .047uf cap or even higher if needed. A lot of people don't think this does much but it really colors the tone. The more resistance you have the more high end Fq will be filtered. If this doesn't work you can also switch for a 500k Pot to a 250k pot to mellow out that pickup. You could buy all this stuff for less then $10 pot in all. If you go paper and oil cap then thats a differnt animal altogether. Honestly I like orange drops the best lately. Cheap and they don't sound as dark as paper and oil.