IMHO a scale anything is too much for a second plane, but then I'm a coward. Retracts would be too much to remember, and too unyielding on a hard, bouncy landing. Engines enclosed in cowlings are also much more difficult to tune and adjust - something you'll still want to be learning and experimenting with on a second plane. Personally, I feel they're a pain to fuel and adjust, too- but that's just me. I'd put the Super Sportster over the Ultra Sport as your #2 for this reason.

Never flown anything on your list, but several club members have Sig Somethin Extras and, as noted before, with low throws they are good flying planes that you can grow into. They are a bit of a handful in windy conditions. The Super Sportsters do nicely, too. Be warned that the SE's jump into the air - and can allow you to develop bad habits which will haunt you if you do go to a larger & heavier tail dragger that needs a longer run-out for takeoff.

My second build - a Contender 60 - is still available and is a very enjoyable sport plane (I added 40% more rudder area, but it is still barely adequate for knife edge). The OS 70II w/13x8 prop gives it plenty of pull. You won't be doing 3-D on par with the Sporsters & Ultra Sports, but is is a good choice for sport pattern learning. Maybe I should say I CAN'T do 3-D as well as the Ultra Sports. Put it on a computer radio like the 9C and you can play with the apron flap and ailerons to do CROW and short field landings. But it would be a snoozer with your .46 engine limitation.

Fie on the industry for no longer kitting an Ugly Stik style airplane. I also wish Kangke would offer the SK-50 as a kit. I'm very happy with mine, but it's hard to personalize (aka "kit bash") an ARF. It revels with a TT .46.