Done it twice. First let me say make an ESC upgrade to at least 40 amps with a 5 amp BEC. HH will not admit a problem with the stock controller but it is known to Brown Out during flight, and when it happens you will crash. The gyros in the SAFE RX use a bit of power.
OK there are two motors I would recommend both from Heads Up RC.
1. The Power Up 15 Sport
with a 40 Amp ESC. It is a bit more powerful than the stock 15 the plane came with coupled with a larger ESC will give you better climb rates with no loss of fly time.
2. The Power Up 25 Sport
with 60 Amp ESC. This is what I have and it is great. Used with a 11 x 7E APC prop will develop a thrust ratio of greater than 1:1. You can stand the plane on it tail and it will go up until you push the nose down. At half power with a 3300 mah battery I get 15 minutes fly time with capacity to spare. If I fly like a glider I can stay up for an hour or more. For the Power Up 25 you will need this adapter
Whatever you do, get rid of the stock 30 amp ESC.....