I'm sorry, someone else beat you to the tickets by about 10 minutes this morning
I think it's definitely possible to have a great Florida vacation without Disney World, there's plenty to do.
I do see Busch tickets go on sale relatively often, right now they're running a deal where you buy a 1-day ticket and get the all-day meal plan free. They also give out 4 free tickets a year to active service members, which I think is pretty neat.
I'm going to do a wrap-up on my trip report and include my park ride list for both Universal Parks and Busch, hopefully those will be helpful to you.
I am loving your trip report and don't want it to end. Thank you for all of your advice and support for our trip in April. With much deliberation and tears I(we) decided to forgo WDW this time and are going to spend a few days at Universal instead. Thanks to your and Josh's coverage I think we might enjoy ourselves somewhere other than Disney. Off you still have the Busch Gardens tix, my daughter and I would love them. My husband has asked to stay in the room on 4/25 to watch the NFL draft so we need something to do. Thanks again for all of your help!