I have several of the Sea Elite second stages and I like them. I have one backup set that I recently put together with only Sea Elite seconds and all our Conshelf sets have Sea Elite SX30 or SX40 seconds as octos. They are simple and easy to service but, then again, I usually service my regs myself. Internally, they are very much like the old US Divers second stages and about the only thing that has to be replaced at servicing is the little puck style LP seat and, maybe, an O-ring. The RX30 and SX30 second stages (same reg, just different color face plates) breathe well and, so far, mine have worked with better than adequate performance for my needs.
The Scout RX330 first stage is an unbalanced piston reg. It is simple and easy to service. That means that it will breathe easy when your tank is full but breathing resistance will begin to increase when your tank pressure drops below about 750 PSI. This is not necessarily a bad thing as it can serve as a warning that you are running low on air. Even at low pressure, you will still get plenty of air, though.
We also have three Sea Elite wetsuits and they are nicely made and comfortable. And Cheap!
As for having the regs serviced, if you don't service your own, the regs can be sent back to Divers Supply for servicing when service is due.
What Herman said is true. Brand names like Aqua-Lung, Apeks, ScubaPro, Zeagle or Atomic might be easier to get serviced locally and all are great regs. They will just cost you more if you want to buy new. I have a long-standing affinity for US Divers/Aqua-Lung myself, though I have recently come to like Edge/HOG as well. That said, you have the option of going with the Sea Elite setup to start out with, if price is a concern and you want new stuff, then getting name brand stuff a little at a time later. The Sea Elite gear would get you started and let you dive and could then be kept as backups after you acquire more expensive gear.
Low cost does not mean unsafe. Divers Supply's Sea Elite brand is good stuff and will work as well as many other, more expensive brands. Like Herman said, service might be a bit of a problem. Divers Supply's house brand is cheaper and the trade-off is, IMO, the minor inconvenience of sending it back to them for servicing. Customer service at Divers Supply is excellent and they have always treated me with exceptional courtesy and on the couple of occasions when there was a problem, they made it right immediately without hesitation.
Good luck and happy diving.