Currently, my 2004 EP3 Si has a k20z3 6 speed transmission, lightweight flywheel, and I assume a puck style clutch (previous owner installed all of it) It being my daily driver, and the fact I drive around 1,000 miles per week, I'm getting really sick of the clutch. Also my synchros are going out in my transmission, every time i've changed my trans fluid, it's been super glittery. The previous owner who swapped the trans also hacked together putting a regular floor style shifter in the place of the EP3 shifter location. I assume from an 06-11 Si since that's where the trans came from. (reference photos)

I have around $1,400 to do the work I need and I just need some guidance on what the best course of action would be

I have 3 options, 1. Sell the car before the transmission gets even worse, it still shifts fine for the most part, ofc I would let the buyer know the possible issue with it. But I already have a lot of time and money into this car, and I absolutely love it. With my car having 256k miles, and the trans issue, I definitely won't get enough out of it to buy another car with lower mileage and less issues. Anything in my price range will have its own set of issues, and whatever I'd buy, preferred to be a sporty car, but also practical, like mine. Thinking 5th gen prelude, 8th gen Si, Honda fit (not sporty but great chassis) 

That brings us to option 2. Rebuild the transmission, and replace the clutch. A rebuild kit is around $800 before shipping and taxes and I'd still need a few other parts that the kit doesn't come with. An OEM Exedy clutch kit and flywheel for EP3 is around $300 before shipping and taxes. I'm able to get the trans out of the car myself and do the clutch, and my mechanic brother in law is willing to help me rebuild the transmission when he has a free weekend. This option would leave me still with the hack job shifter and loose and sloppy shift cables.

Option 3. Replace the transmission with an OEM EP3/RSX 5 speed, swap the LSD from my current trans over, replace the clutch, put an OEM shift box (buddy club) OEM cables, new bushings for the cables, and replace the clutch. This one would leave my slightly over budget but has the benefit of being able to sell my current 6 speed gear set and trans case to recoup some of the cost, even with the bad synchros. Also gives me the chance to replace all of the hacks the previous owner did making the swap work. It's a disadvantage that I have the chance of buying a transmission from a not truthful seller and it also needing new synchros. I can find these with sub 150k miles for $600-$1000 depending on mileage/condition, using the same clutch mentioned previously.

Need some other opinions on whether or not to replace my transmission, rebuild, or sell the car...