naive, check thermaltake's website out...there's no CPU fan that spins at 29000 RPM, which is utterly and so plainly obvious that it makes me puke.
aside from that, any of those thermaltake HSFs will be better than that low-end coolermaster, which, i assume, is the same one they use for retail box CPUs...they cool quite adequately, even for mild overclocking, but if u're hardcore, go w/ something better.
the 6cu is ok, the 6cu+ is better but loud...the 7+ has a variable speed (manual) 7cm fan...it's quite good, even for overclocking - and u won't spend a fortune on the god damned thing...
my 1800+ w/ stock fan runs at 45 celcius under load in the summer (but a basement)...overclocking it at stock voltage to 2000+ speeds didn't raise the temp too much...i'm sure your 1.4 t-bred would be safe w/ that cooler-master, especially since i doubt u'll get it much over 1400 anyway w/ a regular HSF unless u're bumping the voltage up hardcore.