Running a flat spring on a SOA will give you pretty good travel.
Your only way to know if you will need a CV or not is to jackstand the high enough that the rear axle can completely droop. Easiest with the tires off of course.
Then rotate the driveshaft, paying attention for bind.
Personally cheaper is not better when it comes to CV. If you can get away without one, until you can afford a quality set up you would be better off.
That way you do it once.
If you do a cheese SYE andshaft, then beef up your travel, you end up re doing it all over again. Spending twice as much then if you jsut went quality the first time around.
Hack and tap (rubicon express) is the cheapest. And leaves you with the shortest driveshaft and most angle. Also uses the stock output shaft, which is significantly weaker then the after markets.
Advance Standard SYE. 32 spline replacement output shaft, maintains stock driveshaft length.
JB Conversions Super Short SYE. 32 spline shaft, 4-5 inches shorter then stock, or Advances Standard. Most expensive, but allows the most lift, angle, and travel of the three main options out there.
hth