Ballast & Electrical Help for Newbie
	
	
		Thanks in advance for taking the opportunity to look at this...I have a couple of questions. This past fall, I purchased my first wake boat. 05 LSV. Nothing crazy, but it was what we could afford & we're very happy with it. I apologize if the following are dumb questions. 
The boat still has the stock ballast & although that will surf my wife & kids, I'm a big guy & it doesn't create the push necessary for someone of my size even with the biggest board. I was considering upgrading the ballast. It even struggles with my brother who is about 2/3 my weight. I noticed online that there are lots of people selling ballast bags that have come from newer boats that are much larger than the stock ones from my year. There are options for 750's & what I have is still the stock 250's. So my question, do I have to buy a certain brand or type of bag or so long as it will fit in the locker, can I just unplug the stock bags from the pump, buy any larger bag I want, & plug them into the existing pump?
Also, considering doing some interior LED lighting. I will preface this with the fact that I live in the upper Midwest so my boat is in storage. I'd like get the lights for my birthday or Christmas, but don't want to buy them and possibly run out of time to return them if it's going to be a bigger job than I'm willing to do. I know I can hook it up to one of the blank switches on the dash which is wonderful, but I'm curious, when I see people who have the inside of their boats wrapped, or lights in the cupholder areas, etc. I'm assuming this isn't some crazy challenging task, are you cutting holes for the wiring or is there a easy trick to running the wires either in the lockers or somewhere else so they can't be seen? 
Lastly, I have a radio deck in the boat. It supposedly has blue tooth & I've even looked it up in the owner's manual of the head unit to see if there's something I'm missing, but it really won't connect. There are no aux hookups & the lakes we go to are pretty remote so we only have access to one radio station & even that is pretty spotty. I noticed you can grab the head unit and just unplug it from what looks like a big circuit board behind it. Can I just replace the head unit with any of the same brand and just push the new unit into the existing circuit board or will I need to replace them both? Anything else to consider?
Thank you!