This might be helpfull to new members, people new to the Jaguar or people considering the first purchase.
I am a Fender Jaguar enthusiast, i fell in love with the looks of the guitar in my teens and wanted one for years. When i finally got one i did a lot of research and spent hours, days and weeks setting it up and getting it to perform at its best.
After previously using a lot of S.G. type guitars i also tried to 'fatten up' the sound of the Jaguar, i tried four different pickup upgrades in the bridge position and then went one further and purchased a HH model.
Then i got a Vintage model which was the eye opener.
This is my opinion and some may disagree. I realised the Fender Jaguar with its own sound and character is the guitar at its best. It is a guitar with single coil pickups initially designed for 'surf' music and is notoriously a guitar with a lot of treble in its sound.
You can fit anything you like on this guitar but it is still a Jaguar and it will never sound like a Les Paul, Ibanez or whatever else, in fact, save yourself time and money by buying a cheap Multi FX processor like a Korg Toneworks and play your Jaguar through that. Because it is the cheapest, quickest and least time consuming way of getting a rock sound out of the guitar.
Alternatively, if you love the shape but not the sound try the HH model but you will have to upgrade the stock pickups as they are limited as far as humbuckers go. There is also the similar Fender Toronado and Squier Jagmaster, both offering humbucker sounds with the Jaguar look.
If you settle on the Fender Jaguar, particularly the CIJ model the time will eventually come when you feel the pickups are not that great. In my opinion the Antiquity replacements available from Seymour Duncan are one of the best to go for. They have a warmer more mellow sound, the treble is not as harsh and they have more range.
All in all, remember what the Fender Jaguar is.. and love it for what it is.