You know, when I read audiophile reviews and whatnot of gear, I used to laugh or roll my eyes when they used words like 'fatigue' when describing the experience of listening to a subpar adc, dac, amp or whatever. As I've begun building my own rig after spending some time borrowing other people's gear, I truly understand what it means. Getting a decent sound from your gear is different from getting a satisfying sound and your level of satisfaction can change quickly once the newness of some products wears off.
Your best bet is to try and demo the gear before you buy it.
Good luck. If you do try something new (nothing actually wrong with that, mind you) keep us posted on your results. You might stumble upon a great find.