Double french horn or triple french horn?

I am a devoted French Horn player, and I am thinking of buying a French horn. I am not getting a single horn, so at first I thought that I was going to get a double horn, because of the octave ranges, however, I found out that there is a TRIPLE horn. Instead of only having the F and B-flat capabilities of the double horn, it also has an added higher F or an E-flat, making it a lot easier to play the higher and lower notes. But it cost 5K, more than our 54in Plasma TV. The double, on the other hand, cost 3k, or 2.5k. I also have a source-my grandma’s friend- that has availabilities to discounts because of his job. I don’t know about triples, but he sells doubles, and I can get them for up to 1k off! I was wondering if this was worth it to get the triple over the double ( I will only take valid sources of people that actually did research, or have some reference, not people that just decide after reading this)