Sly
The specs for a training machine on a limited budget are quite different from an ultra-light race machine. The aim of training is to work your body, not go as fast as possible.

Ti frames just dont make sense for that role. Carbon forks are generally over-priced. Nice if you have the money, but a high qualuty steel fork (eg Reynolds 531c) works very well, and weighs as much as the cheapest carbon fork.

The real choice is between an Al frame with steel forks and an all steel bike, either will do the job, and the difference in weight is less than you might imagine. For a training bike, try and get one with more clearance for wider tyres, and with threaded eyelets for fenders. Fall training on wet roads is much more comfortable when your butt is dry.

Most serious well educated racers have a special training machine, so they dont wreck their racing steed in bad conditions.