The problem is that you said it would take all your money to get it, but it sounds like it needs some serious work and a lot of extras that you won't have the budget for (pumps, plumbing, sump, heaters, lights, etc.).
I know this is sacrilege (who on MFK WOULDN'T want a 300??!!), but what about picking it up, resealing it and cleaning it up, then selling it back on craigslist for $1000? Then you could pick up a 180 with all the gear and still have all the money you'd need to get it working like you want AND you new CD player?