I definately recommend Defi guages, I have 3 fitted where your clock would sit, they look like they belong and are basically superb ( they allow for playback and record facilities, peak etc).
2 types of these guages Defi Link ( ones I have) and Defi BF ( sexy as), have a look at the group buy by Wuz on this forum as he could also fit em extremely cheaply by the looks of it.
Cheaper option is as Stephen said a Blitz RViT, nice wee thangs they are.
Agree with staying away from A piller mounted, not too keen on them overal on new age scoobs.
Left a pic of my gauges, this has a carbon look pod that I hope to replace with one thats the same colour as the dash, but should give you the idea.
Spooks