You can make spin with the LM Radical, but you really need to "whup" across the ball - I owned a pair and they have less of an inclination for spin production than other frames, but they hit a pretty sweet ball. I was taken in by their feel and maneuverability, but my tennis DNA is stuck on heavier racquets, so I moved on. Tried some lead on my Radicals, btw, with no luck.
If you're a baseliner, need some spin, and are ok with a 12 oz. frame, the Flexpoint Radical Tour is hilarious for turning the ball over. I found a little less pop on my volleys and serves when I demoed it, probably due to its flex, but it was a lot of fun from the baseline for me. Plenty of spin potential with the stability of a heavier frame.
No experience with the Agassi model, but I'd say you're looking a some pretty good gear. I'd suggest dropping the $5 to demo the one that you're pretty sure you want to get. Think of it as insurance against a much more expensive disappointment.