I've never owned a tiel...although I have interacted with them. I don't find them very interesting, but I'm sure once they know you, they are nice enough.
Personally I love my two suns. Everyone tells me they are the noisiest bird. But I have to disagree. The noisiest bird is the ignored bird.
My two girls are both in my living room, so they always get to at the very least be near me. And my wife and I both give them alot of attention. If you play with them alot and talk to them alot, they really aren't THAT noisy. They can be loud, don't get me wrong, but typically they only get super loud when someone unexpectedly drops by (I ALWAYS let them know if we are going to have company), when my wife or I talk about something with great excitement they just HAVE to join in the conversation), and especially when we get home from work or just get up in the morning. They seem to love yelling "HI HI HI!!!!" in aratinga dialect for a few minutes to celebrate that we're together again...
And personality-wise, these birds are amazing. While I often have real trouble telling the two apart at first glance, I ALWAYS know who is who once they start interacting with me. They are sooo different and unique.
My girl Charlie (named before I got her...OR found out she was a girl) is very dominant. She loves being in high places as acts as the "look out" of our family. She LOVES to chew on things. I've seen her strip a tongue depressor stick to splinters in minutes. In fact anything she can chew up and destroy is alot of fun for her. Unfortunately, she's also not that great of an eater. I'm pretty sure she was raised on nothing but seed and is a sunflower seed junkie (thus I feed her very few in her mix). She is VERY picky about trying new foods, but she loves Sally Blanchard's "Glop" recipe. Charlie is a super show off. She loves meeting new people and fluffs up or does a Stevie Wonder impression and gives lots of kissy noises and giggles. She can say, "Step up" and "NO!" (I used no quite a bit when I first got her...she was not very well behaved at all). When I lay down in bed, she'll actually just sit of my chest very contented.
Petiout (pronounced Pee-too) is a real sweetheart. I'm almost sure she's only a few years old. She has some 'young bird' tendencies. She is VERY inquisitive and loves to chew on cloth and towels (although I get kind of nervous when she does that). She loves playing in little caves and crevices in those towels or whatever. She giggles when she gets really excited. She loves taking baths splashing around in a large shallow dish and loves getting a blow dry afterwards. She is a REALLY good eater. She'll try pretty much anything once, veggies (she grabbed a whole baby carrot last night from 'mom'...it was really cute), any fruit, you name it, she'll try it. I also think she was sort of abused as large objects (like brooms or any long white object) make her very scared and she screams a warning when she see them. She's a little afraid of men (except me) and will actively bite them. Girls however, what can I say but once she gets to know a girl, she wants to be with her as much as possibly including flying off her perch or cage to get to you. She's a real sweetheart.
Both girls go CRAZY for honey nut cheerios (organic generic brands) and ice cream.
I consider both of my girls my children, and I'm really rather happy with them as my 'kids' and don't really feel the need to make any human versions.
I'd wholeheartedly suggest a conure...if you're up to it that is. If you got the time and patience and wallet, go for it 