A good USED running 350 can be had for $500 or less, a 305 can be had for $300 or less. Either of these will be a fine replacement. There is no headaches of chasing down problems, its the cheapest option, and you will likely have MORE power. When buying a used one go with one that is fuel injected and is clean under the valve cover, best case scenario one that you can hear run (but that isn't always possible).
I would go the 350 route as it'll have more power and if you should ever sell the car is worth more than a 305. If you still want to add a little something extra I would get a chrome dress up kit, a clean aluminum intake, headers and an RV cam. That's what you'll see a lot of at car shows as its cheap and effective.