A list of good second planes:

First Hand Experience

Sig Four Star 40 or 60 (kit of Arf)
Goldberg Tiger 40 or 60 ( kit or arf )
Ace Cloud Dancer (60 size Arf only)
Sig Astro Hog (kit only)
Senior Falcons
GP Big Sticks (the old school kits )

Any of these planes will be in your hanger long after you have moved on to something else.

Look good but never had experience with them:

World Models Rambler (appears to be modeled after the Astro Hog )
GP Big Stick Arfs
Goldberg's new aft's Senior Falcon and Skylark.
GP Easy Sport
GP Rapture