If you like the sound of the Tiny Terror I would go with that.
I have not been very impressed with the reliability of the Marshall 1974. I have seen several for repair. The plate voltage is around 400 V (cf 320 on an original 1974). Furthermore I have measured the plate dissipation at over 20 Ws (cf a 12 W maximum) for EL84s. This is not good for reliablility to say the least, and most of the faults in these amps are due to failure of components in the power stage. I have also had to change the mains transformer in one amp. This shouldn't happen in a new amp.
I suspect the higher plate voltage was used to get more clean head room, although that's not really the point of this amp, nor true to the original design. As a mate of mine says, a lot of re-issue amps are really re-issue boxes, with something similar inside.
I know the designer of Orange amps quite well, and he was telling me that out of 8,000 amps shipped they have only had 3 or 4 back for repair under warranty.
A more adventurous choice might be a 70's Watkins Dominator. Either the Mk III 1 x12 guitar combo or the Mk I 1 x 15 bass combo. These can still be found for £200-300, although they might need some work. Incidentally the guitar version was used extensively on the first Oasis album.
