Mr. Joshua,
I'm sure you'll find Silverjet a good experience. However, having flown on them twice in the last year, I have to say that I would prefer the seats you originally chose.
On Silverjet, none of the seats have storage areas, all hand baggage has to go overhead. However, with it being a 100-seat 767, there's plenty of room for everyone in that regard.
The seats in row 1 have even more leg room than the others. Whilst all the seats are the same in that they recline to an 'almost' lie flat bed, this is only achieved in the other seats by moving your own feet under the seat in front. I found this slightly annoying when laying in the seat face up, as my toes would then hit the bottom of the seat in front, and stop me from fully reclining the seat...So I had to sleep on my side. And I'm only 5ft8.
No such worries in row 1!!!