I have been using my 703 full-time to help in the development of PSK31 Deluxe since May. The drivers failed in early June (during a SSB QSO!) and the rig was returned repaired within a week. Apart from that it has behaved itself impeccably.
I'd advise you to get a 500Hz CW filter, as this can be used for digital modes RX too. Combined with the standard TXCO you then have a pretty good rig.
If you are interested in PSK31 and maybe even computer control of your rig, take a look at the great freeware HAM RADIO DELUXE package available from http://www.hb9drv.ch
145, Pete PH1PH - G7ECN