In no particular order you should consider these pumps....

Abbott Gemstar;
Baxter i-pump (or their newer version);
Deltec CADD Prizm or VIP, CADD 1, CADD Plus, CADD PCA from Smiths Medical (used to be Graseby);
Micrel Rythmic from AMS Medical;
McKinley Medical have an interesting Israeli pump which is worth a look, sorry can't remember the name;

MDA did a fairly good report on these in the last couple of years

If you want Ambulatory syringe drivers then you've only really got the..

MS16a & 26 from Smiths (Graseby)
Micrel MP Hourly, MP Daily, MP100 & MP200 from AMS

Good luck.