Re: #28 - Most of my work outside of logotournament is typeface design, by which I mean the creation of original typefaces, not the customisation of existing ones.
The font used for the tagline is one of my ownpublished fonts, Chapaza (http://www.dafont.com/chapaza.font). The font used for 'Think' is a current work-in-progress and has not been published.
I've uploaded an all-lower case version (#30) and one that ends with a capital C. Unfortunately, I have not developed the capital c for this new font yet so I've used a substitute font. There are some stylistic differences between the substitute and what I imagine the capital C will look like when drawn, but this will allow you to visualise the concept.
I chose a serif font because they tend to have a certain gravity and engender trust, which is why we see a lot of serif fonts in the legal profession. I felt these were attributes that would resonate with the clients you describe in your brief. The reason I chose this particular serif is because you mentioned your clients are youth-oriented and do not see themselves as ageing. The style of this serif is quite modern and quirky. The image dimensions probably make the detail difficult to discern, but the serifs are asymmetrical both in size and style. This is why I thought this new font would be better suited to the brief than, for example, Chapaza, which has a more traditional Baskerville-esque feel.
Also, it's unique to this project. I have several fonts that are works-in-progress, but this is one of only two that have never been used before.
As for other fonts - I like, wherever possible, to give clients unique (or, almost-unique) type solutions when they ask for lettermark logos. I have an unpublished three-weight sans serif font family (in the Gotham/Proxima Nova style) which I can experiment with. I have only used it on two or three logos so far, so it remains relatively exclusive. I also released Plateia Bold about a year ago (http://www.dafont.com/plateia.font), but only one weight. I actually drew six weights, three of which have never been used. Does this 'squarer' look appeal?
The other alternative is to create a lettermark from scratch, which I've no objections to attempting if you have the time to give me some more detailed thoughts about the sort of style that will appeal.
Please see #43 and #44. Both use two weights of an unpublished three-weight sans serif font family I have been working on. Since my last comment, I checked its usage; it has only ever been used once before.
I retained the exclamation mark from the other font as I felt it had a bit more 'life' to it.
#58 is a variation on #29. My son saw the design on my PC this morning and asked why the letters in 'Th!nc' were so far apart. I think he was probably right, but it's quite an observation for a 6-year old!
So, #58 has a slighter 'tighter' feel. I also shortened the arms of the 'T' a little bit for balance.
My personal preference for a short word is usually (though not always) all lower case, simply because it's so easy to disrupt the optical balance when a short word contains a single capital letter. The effect in longer words is less noticeable. This was the reason I oversized the exclamation mark... it helped distribute the weight a little better when the capital 'T' is used.
Also, I happen to like the aesthetic of a lower case 't'. :) I don't know how clearly you can see the 't' in #30, but there is quite a lot going on in terms of its design.
The gold design was offered as an alternative to the purple/grey. I originally chose purple for its association with luxury. The neutral light grey helped the purple 'pop'. The gold is similarly a colour of luxury, though more obviously associated with wealth. I paired it with a darker grey for contrast.
There are only a few hours left - if there are any variations you would like me to experiment with, please let me know and I will do my best to get them uploaded before your contest ends.