Not knowing exactly which model of Sedona you have, I would think the Trek 7300 would not be a huge improvement. Don't get me wrong, it's a great bike (DH has one), but it is built for comfort and not speed. I would definitely try some road bikes before I bought anything (I personally am a road bike junky). I, too, am swayed by appealing looks, but only if the bike is something better than I already have. On the other hand, if it fits, and it makes you smile and ride more, go for it. Maybe next years tax refund can buy you a road bike.
P2
2018 Trek Silque SLR6 - Selle SMP Glider
2018 Specialized Dolce EVO Comp - Selle SMP Glider
2011 Trek Madone 5.2 WSD -Selle SMP Glider
2013 Giant TCX W - Oura 143